a) 7x ( 18 – a ) – 56 = 7
b) 145 – 5x ( a + 8) = 25
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a) 7x ( 18 – a ) – 56 = 7
b) 145 – 5x ( a + 8) = 25
Giúp mình với ạ.Mình cảm ơn
K
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Những câu hỏi liên quan
24 tháng 11 2015
7x+2/5x+7=7x-1/5x+1=>37/5x+7=34/5x+1=>37/5x-34/5x=1-7=>3/5x=-6=>x=-6:3/5=-10 vay x=-10 nho ****
NX
17 tháng 8 2023
a) \(\dfrac{3}{8}+\dfrac{15}{-25}+\dfrac{3}{5}\)
\(=\dfrac{-9}{40}+\dfrac{3}{5}\)
\(=\dfrac{3}{8}\)
b) \(\dfrac{-5}{18}+\dfrac{23}{45}-\dfrac{9}{10}\)
\(=\dfrac{7}{30}-\dfrac{9}{10}\)
\(=\dfrac{-2}{3}\)
c) \(\dfrac{-5}{12}+\dfrac{15}{18}-2,25\)
\(=\dfrac{5}{12}-2,25\)
\(=\dfrac{-11}{6}\)
d) \(\dfrac{5}{6}+\dfrac{2}{3}-0,5\)
\(=\dfrac{3}{2}-0,5\)
\(=1\)
TD
25 tháng 12 2016
a) - ( 231 + 16 - 75 ) + ( 25 - 9 )
= - 231 - 16 + 75 + 25 - 9
= - 247 + 100 - 9
= -147 - 9
= -156
b) - ( - 231 + 17 ) - ( 54 + 23 )
= 231 + 17 - 54 - 23
= 248 - 31
= 217
c) - [ ( - 25 ) - 7 + ( 8 - 16 ) ] - [ ( - 21 + 3 ) - 7 ]
= - [-32 + (-8) ] - [ -18 - 7]
= - (-40) - (-25)
= 40 + 25
= 65
d) - ( - a - b - c ) + ( - c - b + a )
= a + b + c - c - b + a
= a+ b + 0 - b + a
= a + a + b - b
= a + a + 0
= 2a
e) ( - 26 ) - [ - ( 18 - 6 + 7 ) + ( 8 - 9 ) ]
= -26 - [ -18 + 6 - 7 + 8 - 9]
= -26 - (-20)
= -26 + 20
= -6
VN
Võ Ngọc Phương
VIP
23 tháng 7 2023
a) \(\dfrac{-5}{11}+\left(\dfrac{-6}{11}+1\right)\)
\(=\dfrac{-5}{11}+\left(\dfrac{-6}{11}+\dfrac{11}{11}\right)\)
\(=\dfrac{-5}{11}+\dfrac{5}{11}\)
\(=0\)
b) \(\dfrac{2}{3}+\left(\dfrac{5}{7}+\dfrac{-2}{3}\right)\)
\(=\dfrac{2}{3}+\dfrac{-2}{3}+\dfrac{5}{7}\)
\(=0+\dfrac{5}{7}\)
\(=\dfrac{5}{7}\)
c) \(\left(\dfrac{-1}{4}+\dfrac{5}{8}\right)+\dfrac{-3}{8}\)
\(=\dfrac{-1}{4}+\dfrac{-3}{8}+\dfrac{5}{8}\)
\(=\dfrac{-2}{8}+\dfrac{-3}{8}+\dfrac{5}{8}\)
\(=0\)
d) \(\dfrac{3}{4}.\dfrac{7}{25}+\dfrac{3}{4}.\dfrac{18}{25}\)
\(=\dfrac{3}{4}.\left(\dfrac{7}{25}+\dfrac{18}{25}\right)\)
\(=\dfrac{3}{4}.1\)
\(=\dfrac{3}{4}\)
Chúc bạn học tốt
25 tháng 2 2022
\(a,\dfrac{-3}{5}:\dfrac{15}{18}=\dfrac{-3}{5}\times\dfrac{18}{15}=\dfrac{-3}{5}\times\dfrac{6}{5}=\dfrac{-18}{25}\\ b,\dfrac{-5}{1}:\left(-4\right)=\left(-5\right):\left(-4\right)=\dfrac{5}{4}\\ c,-28:\dfrac{-7}{25}=-28\times\dfrac{25}{-7}=100\\ d,\dfrac{51}{8}:\dfrac{-2}{10}=\dfrac{51}{8}\times\dfrac{10}{-2}=\dfrac{51}{8}\times\left(-5\right)=\dfrac{-255}{8}\)
GA
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DT
Đỗ Thanh Hải
CTVVIP
30 tháng 9 2021
1 is watered by my father everymorning
2 is prepared by her mother in the kitchen
3 should be cleaned twice a day
4 repainting before Tet
5 was invited to his birthday party by John last night
6 of the car has to be repaired
7 won't be hung in the living room
8 the most valuable painting in the national museum been stolen
9 were told this story by their grandmother when they visited her last week
10 taken by a man when we were......
11 given up smoking since last year
12 read War and Peace since 2005
31 tháng 5 2023
C nguyên
=>2căn x+2+3 chia hết cho căn x+1
=>căn x+1 thuộc Ư(3)
=>căn x+1=1 hoặc căn x+1=3
=>x=4 hoặc x=0
a) \(7\times\left(18-a\right)-56=7\)
\(7\times\left(18-a\right)=7+56\)
\(7\times\left(18-a\right)=63\)
\(18-a=63:7\)
\(18-a=9\)
\(a=18-9\)
\(a=9\)
______
b) \(145-5\times\left(a+8\right)=25\)
\(5\times\left(a+8\right)=145-25\)
\(5\times\left(a+8\right)=120\)
\(a+8=120:5\)
\(a+8=24\)
\(a=24-8\)
\(a=16\)
a) a = 9
b) a = 16