Chứng minh rằng A không chia hết cho 7:
A=2+2\(^2\)+2\(^3\)+2\(^4\)+.......+2\(^{99}\)+2\(^{100}\)
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23x+1 = 16
23x+1 = 24
=> 3x + 1 = 4
=> 3x = 4 - 1
3x = 3
x = 3 : 3
x = 1
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35 x 85 + 3 x 5 x 35 - 3250
= 35 x ( 85 + 3 x 5 ) - 3250
= 35 x 100 - 3250
= 3500 - 3250
= 250
2) \(\left(x-1\right)^2=9\Rightarrow\left(x-1\right)^2=3^2\Rightarrow x-1=3\Rightarrow x=4\)
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