Đáp án:
$(-2019)+(-29)+2019-71$
$=-29-71=-100$
$3(x-12)+12=15$
$3x-36+12=15$
$3x=39$
$x=13$
$2^x-2^0=7$
$2^x-1=7$
$2^x=8=2^3$
$x=3$
Giải thích các bước giải:
(-2019)+(-29)=-2048+2019=-29-71=-100
3.(x-12)+12=153.(x-12). =15-12
3.(x-12) =3
(x-12) =3:3
x-12 =1
X. =1+12
x. =13
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