Question

ПОМОГИТЕ ПЖЖПЖПЖПЖЖПЖП​

Answer 1

( а )

$\displaystyle\\3-2a=3a-7\\\\-2a-3a=-7-3\\\\-5a=-10\\\\a=-10:(-5)\\\\a=2$

Проверка:

$3-2*2=3*2-7\\\\3-4=6-7\\\\-1=-1$

( б )

$\displaystyle\\-2(x-2)=3(x+1)\\\\-2*x-2*(-2)=3*x+3*1\\\\-2x+4=3x+3\\\\-2x-3x=3-4\\\\-5x=-1\\\\x=-1:(-5)\\\\x=0,2$

Проверка:

$\displaystyle\\-2(0,2-2)=3(0,2+1)\\\\-2*(-1,8)=3*1,2\\\\3,6=3,6$

( в )

$\displaystyle\\x+5=3x-7\\\\x-3x=-7-5\\\\-2x=-12\\\\x=-12:(-2)\\\\x=6$

Проверка:

$6+5=3*6-7\\\\11=18-7\\\\11=11$

( г )

$\displaystyle\\2(t+3)=-7(t-3)\\\\2*t+2*3=-7*t-7*(-3)\\\\2t+6=-7t+21\\\\2t+7t=21-6\\\\9t=15\\\\t=15:9\\\\t=1\frac{6}{9}\\\\t=1 \frac{2}{3}$

Проверка:

$\displaystyle\\2(1\frac{2}{3}+3)=-7(1\frac{2}{3} -3)\\\\2(\frac{5}{3}+\frac{3}{1})=-7(\frac{5}{3}-\frac{3}{1})\\\\2(\frac{5}{3}+\frac{9}{3})=-7(\frac{5}{3}-\frac{9}{3})\\\\2*\frac{14}{3}=-7*(-\frac{4}{3}) \\\\\frac{28}{3}=\frac{28}{3}\\\\9\frac{1}{3}=9\frac{1}{3}$