12-3x = 155 : 152
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DV
0
6 tháng 8 2023
a: Số số hạng là (155-8):3+1=50(số)
b: Số thứ 30 là:
8+29*3=8+87=95
TM
6 tháng 8 2023
(a) Công thức tính số hạng của dãy số cách đều: \(n=\dfrac{a_n-a_1}{d}+1\) với \(a_n\) là số hạng cuối cùng, \(a_1\) là số hạng đầu tiên và \(d\) là khoảng cách giữa các số hạng.
Dễ thấy, dãy \(S\) gồm các số hạng cách đều \(3\) đơn vị, số hạng đầu là \(8\), số hạng cuối là \(155\), vì vậy, số số hạng của dãy \(S:n=\dfrac{155-8}{3}+1=50\) số hạng.
(b) Số hạng thứ \(30\) là: \(8+3.\left(30-1\right)=95\).
(c) Công thức tính tổng dãy số cách đều: \(\dfrac{\left(a_1+a_n\right)\cdot n}{2}\) với \(a_1,a_n,n\) lần lượt là số hạng đầu tiên, số hạng cuối cùng và số số hạng của dãy.
Áp dụng vào bài toán thì \(S=\dfrac{\left(8+155\right)\cdot50}{2}=4075.\)
NM
1
MD
1
16 tháng 3 2020
1)-(-3)3-(2x+1)3=152
27-(2x+1)3=152
(2x+1)3=-125
(2x+1)3=(-5)3
2x+1=-5
2x=-4
x=-2
2)-(x+6)-34=12+3x
-x-6-34=12+3x
-x-3x=12+6+34
-4x=52
x=-13
DT
Đỗ Thanh Hải
CTVVIP
22 tháng 6 2021
152. Is that her brother? – Yes, _ his_ _ name is Thomas.
153. Why don’t we go to the _ _beach _ _ _ this Sunday?
154. ………….. - I’m tired.
A. How are you feel. Ken? B. How do you feel, Ken?
C. How can you feel, Ken? D. How would you feel, Ken?
155. A. father B. car C. care D. park
156. like / in autumn ? / is / the weather / What
............................What is the weather like in autumn.......................................................................................................................
157. like a / would / chocolate. /I / box of
..................I would like a box of chocolate .................................................................................................................................
158. What’s the weather _ _ like_ _ in spring in Paris?
159. My little son’s classmate is _on_ the second floor.
160. Hurry up, or we are late ……………….school.
A. for B. to C. at D. in
161. What time will you arrive ……………the station? – 8 a.m.
A. to B. in C. at D. on
162. has an / library. / The / school / excellent
......................................The school has an excellent library.............................................................................................................
163. Janes wants to go out tonight but she has got too _ _ much_ _ work to do.
164. Does your class _ _ have_ _ forty-five students?
165. My school is at………………………
A. 30 Hoang Hoa Tham Road B. Hoan Kiem District
C. a village far frrom here D. Nam Dinh province
166. Selena eats …………………..every morning.
A. a big breakfast B. a bowls of noodles C. rice D. All are correct
167. STA_MP
168. _ _Will _ _ you go to church with me this Christmas?
169. Dolphins can’t live in _ _ _ _ _ _ _ _ water, but a lot of the sea is polluted. (nghe)
170. When do you have math? – We have it _on_ Mondays.
171. His job is designing buildings. He is a(n)………architect…………………..
172. You can’t ………………………..over the wall. It’s too high. (nghe)
173. Thanks for your helping me carry that box? - _ My_ pleasure.
174. The other _ _ name_ _ of Thanksgiving Day is Turkey Day.
175. Mathew won’t _ go_ fishing with his friends.
176. My father gave up smoking be_ _cause _ _ _ of his coughs.
177. It’s four _ _ o'clock_ _ _ _ .
178. _No _ one in my class is taller than Anh.
179. Princess Merida has long _ _ _ _ _ red hair.
180. They run down…………………..(nghe)
181. Hong likes to help her parents _ _with _ _ the farm work.
182. Can you go to the supermarket to buy some _ _ _sausag _ _ _es.
183. LA_RGE
184.Joe has a ………………………..cake on his birthday? (nghe)
185. There’s _no _ milk left. You should go to the market to buy some.
186. What’s the weather like today? – It’s _ _ sunny_ _ _ .
187. BI_RTH
188. There are a lot of ……………………….under the tree. (nghe)
189. Don’t t_ _ hrow_ _ trash in the street.
190. Their house is _ _ _ _between _ _ _ a toy store and a bookstore.
L
22 tháng 6 2021
152. Is that her brother? – Yes, _ his_ _ name is Thomas.
153. Why don’t we go to the _ _beach _ _ _ this Sunday?
154. ………….. - I’m tired.
A. How are you feel. Ken? B. How do you feel, Ken?
C. How can you feel, Ken? D. How would you feel, Ken?
155. A. father B. car C. care D. park
156. like / in autumn ? / is / the weather / What
............................What is the weather like in autumn.......................................................................................................................
157. like a / would / chocolate. /I / box of
..................I would like a box of chocolate .................................................................................................................................
158. What’s the weather _ _ like_ _ in spring in Paris?
159. My little son’s classmate is _on_ the second floor.
160. Hurry up, or we are late ……………….school.
A. for B. to C. at D. in
161. What time will you arrive ……………the station? – 8 a.m.
A. to B. in C. at D. on
162. has an / library. / The / school / excellent
......................................The school has an excellent library.............................................................................................................
163. Janes wants to go out tonight but she has got too _ _ much_ _ work to do.
164. Does your class _ _ have_ _ forty-five students?
165. My school is at………………………
A. 30 Hoang Hoa Tham Road B. Hoan Kiem District
C. a village far frrom here D. Nam Dinh province
166. Selena eats …………………..every morning.
A. a big breakfast B. a bowls of noodles C. rice D. All are correct
167. STA_MP
168. _ _Will _ _ you go to church with me this Christmas?
169. Dolphins can’t live in _ _ _ _ _ _ _ _ water, but a lot of the sea is polluted. (nghe)
170. When do you have math? – We have it _on_ Mondays.
171. His job is designing buildings. He is a(n)………architect…………………..
172. You can’t ………………………..over the wall. It’s too high. (nghe)
173. Thanks for your helping me carry that box? - _ My_ pleasure.
174. The other _ _ name_ _ of Thanksgiving Day is Turkey Day.
175. Mathew won’t _ go_ fishing with his friends.
176. My father gave up smoking be_ _cause _ _ _ of his coughs.
177. It’s four _ _ o'clock_ _ _ _ .
178. _No _ one in my class is taller than Anh.
179. Princess Merida has long _ _ _ _ _ red hair.
180. They run down…………………..(nghe)
181. Hong likes to help her parents _ _with _ _ the farm work.
182. Can you go to the supermarket to buy some _ _ _sausag _ _ _es.
183. LA_RGE
184.Joe has a ………………………..cake on his birthday? (nghe)
185. There’s _no _ milk left. You should go to the market to buy some.
186. What’s the weather like today? – It’s _ _ sunny_ _ _ .
187. BI_RTH
188. There are a lot of ……………………….under the tree. (nghe)
189. Don’t t_ _ hrow_ _ trash in the street.
190. Their house is _ _ _ _between _ _ _ a toy store and a bookstore.
15 tháng 1 2016
( - 152 ) - ( 3x+1 ) = (-2) . (-77)
(- 152 ) - (3x +1 ) = 154
3x +1 = (-152)- 154
3x + 1 = -306
3x = - 306 - 1
3x = - 307
x = - 307 : 3
x = - 307 / 3 ( dấu / là chỉ phân số)
DN
5
9 tháng 2 2020
a, => x= -9. 2
=> x= -18
b, => x= 12. (-4)
=> x=-48
c, => 152-(3x-1)=54
=> (3x-1)= 152- 54= 98
=> 3x= 98+1= 99
=> x = 99:3
=> x = 33
12-3x=3375
3x=3375+12
3x=3387
x=3387:3
x=1129
12-3x=15^3
12-3x=3375
3x=12-3375
3x= -3363
x= -3363 : 3
x= -1121