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a) ( 195 - x3 ) : 7 + 105 : 102 = 28 . 22
=> (195 - x3 ) : 7 + 1000 = 1024
=> (195 - x3 ) : 7 = 1024 - 1000 = 24
=> 195 - x3 = 24 . 7 = 168
=> x3 = 195 - 168 = 27
=> x = 3 hoặc x = - 3
Vậy : x = 3 hoặc - 3
b) 3 . ( x2 - 65 ) + 15 = 810 : 88 - 1690
=> 3 . ( x2 - 65 ) + 15 = 64 - 1 = 63
=> 3 . ( x2 - 65 ) = 63 - 15 = 48
=> x2 - 65 = 48 : 3 = 16
=> x2 = 16 + 65 = 81
=> x = 9 hoặc x = - 9
Vậy : x = 9 hoặc x = - 9
1.
3A= 3(3+32+ ...+ 32017)
3A= 32 + 33 + .... + 32018
Lấy 3A - A = (32 + 33 +...+ 32018) - (3+32+...+32017)
2A = 32018 - 3
2A+3 = 32018 - 3 +3 = 32018
=> 2A+3 là một lũy thừa của 3
Ta có :
\(A=75\left(4^{10}+4^9+...+1\right)+25\)
\(\Rightarrow A=75.4^{10}+75.4^9+....+75.4+75.1+25\)
\(\Rightarrow A=300.4^9+300.4^8+....+300+100\)
=> A chia hết cho 100
, .
...1.I...am very lucky . I go to a wonderful . country...2.... I enjoy it very much . I don't have much . homework...3....so I have plenty of time to .. do..4.... interesting things . I do a lot of ... sport..5..... I go to an exercise class , go .. to..6.... dance classes , and I swim . twice..7.... a week . I love going to the.. movies..8.... with my friends . Some times we have parties . On the . weekend...9.... we often go on cycle rides into the fresh air of the .. school..10.... .
Bạn ơi, đăng qua môn toán nhé ở đây là môn tiếng anh, lần sau chú ý hơn nha
Tìm x, biết:
a. 12 + x = 122
=> x=122-12
=> x= 110
b. | x | + 4 = 8
=> /x/=8-4
=> /x/=4
=> x={4;-4}
c. 3x - 5 . 32 = 32 . 4
=> 3x=32.(4+5)
=> 3x=32.32
=> 3x=34
=> x=4
a)
\(12+x=122\)
=> \(x=110\)
Vậy \(x=110\)
b)
\(\left|x\right|+4=8\)
\(\Rightarrow\left|x\right|=4\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=4\\x=-4\end{array}\right.\)
Vậy x=4 ; x = - 4
c)
\(3^x-5.3^2=4.3^2\)
\(\Rightarrow3^x=3^2\left(4+5\right)\)
\(\Rightarrow3^x=3^4\)
=> x=4
Vậy x=4
EX1:Fill in the blank of the following passege with ONE suitable word.
Bloom lives (1) ...IN........ a village in Africa. Her day (2)...BEGINS...... at 5 o'clock. She (3)....GETS...... up and she walks three kilometers (4).....TO... the river. She collects (5) .....SOME..... water, and she carries it back (6).....TO.... her house. (7).....THE...... water is very heavy. It isn't clean but there (8)...ISN'T........any water in their village.Bloom doesn't (9)...GO....... to school. She can't read or write.She helps her mother (10) ....IN...... the house.
EX2:Ewrite each of the sentences below in such a way that its meaning is similar.
1.The Amazon River is longer than the Mekong River.
=>The Mekong River is shorter than the Amazon River
2.How long is the road?
=>What is the length of the road?
3.The girls are beautiful.
=>They are beautiful girls
4.Thuy is the fattest girl in my class.
=> No one in my class is fatter than Thuy
5.There is a lot of rain in Viet Nam.
=>Viet Nam has a lot of rain
1.The Amazon River is longer than the Mekong River.
=>The Mekong River is smaller than the Amazon River
2.How long is the road?
=>What is the length of the road?
3.The girls are beautiful.
=>They are beautiful girl.
4.Thuy is the fattest girl in my class.
=> No one is fatter than Thuy in my class.
5.There is a lot of rain in Viet Nam.
=>Viet Nam has a lot of rain
1. She is very beautiful.
2. Mai’s sister is a singer.
3. Her teeth are small and white.
4. Is your father a farmer ?
5. It’s very noisy in the city.
6. Our children are in the bookstore.
7. Don’t go straight ahead.It’svery dangerous.
8. I’m watching television now.
~~~~Good luck~~~~
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