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`@` `\text {Ans}`
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`15/16 \times x = 9/40`
`=> x = 9/40 \div 15/16`
`=> x=9/40 \times 16/15`
`=> x = 6/25`
Vậy, `x=6/25.`
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38 - x.12 - x.16 = 40
38 - x.(12+16) = 40
38 - 28.x = 40
28.x = 40 - 38
28.x = 2
x= 2/28
x=1/14
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a) 2.x - 16 = 40 + x
=> 2.x - x = 40 + 16
x = 56
b) 16 - 2.x = 40 - 3.x
=> -2x + 3.x = 40 -16
x = 24
c) 6.(x-1) - 5.x = 15
6x -6 - 5.x = 15
6x-5x - 6 = 15
x - 6 = 15
x = 21
d) 2.(4.x-2) - 7.x = 16
8x - 4 - 7x = 16
8x-7x - 4 = 16
x - 4 = 16
x = 20
\(a,2x-16=40+x\)
\(\Rightarrow2x-x=40+16\)
\(\Rightarrow x=56\)
\(b,16-2x=40-3x\)
\(\Rightarrow-2x+3x=40-16\)
\(\Rightarrow x=24\)
\(c,6.\left(x-1\right)-5.x=15\)
\(\Rightarrow6x-6-5x=15\)
\(\Rightarrow x=21\)
\(d,2.\left(4x-2\right)-7.x=16\)
\(\Rightarrow8x-4-7x=16\)
\(\Rightarrow x=20\)
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( 40-x)+5=16
(40-x) =16-5
(40-x) =11
x =40-11
x = 29
k mik nha mik đang âm điểm đây!!!
3.2^x + 16 = 40
=> 3.2^x = 24
=> 2^x = 8 = 2^3
=> x = 3