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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
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
\(74.\) \(\left(2x-1\right)^3\)- \(5^2\)= \(7^{18}:7^{16}\)
\(74.\)\(\left(2x-1\right)^3\)\(-5^2\)= \(7^{18-16}\)
\(74.\)\(\left(2x-1\right)^3\)\(-25\)= \(7^2\)
\(74.\)\(\left(2x-1\right)^3\)\(-25\)= \(49\)
\(74.\)\(\left(2x-1\right)^3\)= \(49+25\)
\(74.\)\(\left(2x-1\right)^3\)= \(74\)
\(\left(2x-1\right)^3\)= \(74:74\)
\(\left(2x-1\right)^3\)= \(1\)
\(\left(2x-1\right)^3=1^3\)
\(2x-1=1\)
\(2x=1+1\)
\(2x=2\)
\(x=2:2\)
\(x=1\)
Vậy x = 1
a)x2 +x =0
x(x+1)=0
* x=0
* x+1=0
x=0-1
x=-1
Vậy x=0 hoặc x=-1
2.(x-1) +3(x-2) =x-4
2x-2+3x-6=x-4
x+3x-x=-4+2+6
3x=4
x=\(\frac{4}{3}\)
a,
x2 +x =0
\(\orbr{\begin{cases}x^2=0\\x=0\end{cases}}\)
Vậy x= 0
b,2.(x-1) +3(x-2) =x-4
2x - 2 + 3x - 6 = x - 4
2x + 3x - x = -4 +6 + 2
4x = 0
Vậy x = 0
Bài 1 : Chia đông từ trong ngoặc .
1.What are there to drink for dinner?
2. We are tired and we'd like to sit down.
3. What does your sister want? - She wants a cold drink .
4. I am not hungry and I don’t want any rice .
5. Are there any bananas ?
6. What does Mr Minh feel now ?
5 Are there any bananas?
2 were - to sit
4 am not , don't want
( mấy câu kia mk thấy đề sao sao ý )
-292 - { 1357 + 4 [( -8)3 + ( 18 - 146 ) : ( 7 -3 )2 ]}
= ( - 841 )- { 1357 + 4 . [ ( -512 ) + ( 18 - 146 ) : 16
= ( - 841 ) - { 1357 + 4 . [ ( -512 ) + ( - 128 ) : 16 ]}
= ( - 841 ) - { 1357 + 4 . [ ( -512 ) + ( - 8 ) }
= ( - 841 ) - { 1357 + 4 . ( - 520 ) }
= ( - 841 ) - { 1357 + ( -2080 ) }
= ( - 841 ) - ( -723 )
= ( - 118 )
Ta có: 1/22< 1/1.2=1-1/2
1/32<1/2.3=1/2-1/3
..............................
1/1002< 1/99.100=1/99-1/100
Do đó: 1+1/22+1/32+...+1/1002< 1+1-1/2+1/2-1/3+....+1/99-1/100
=> 1+1/22+1/32+....+1/1002<1+1-1/100=2-1/100<2
nên 1+1/22+1/32+....+1/1002<2
Vậy 1+1/22+1/32+...+1/1002<2