Question

РЕБЯТА,СРОЧНО!!!!!!!!!!! УМОЛЯЮ, ПОМОГИТЕ, ПЛИЗ!!!!!!!! АЛГЕБРА 7 КЛАСС!

Answer 1

1.

$\frac{a}{b} -\frac{2}{3}a+\frac{b}{5} =\frac{-0,45}{1,8}-\frac{2}{3}\cdot (-0,45)+\frac{1,8}{5}=-\frac{45}{180}+\frac{2}{3}\cdot \frac{45}{100}+\frac{18}{50}=\\\\=-\frac{5}{20}+\frac{3}{10}+\frac{36}{100}=-0,25+0,3+0,36=0,41$

2.

$1-\frac{2}{3} a= 0\\\\1=\frac{2}{3}a\\\\a= \frac{3}{2} \\ \\ a= 1,5$

Answer 2

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