Question

пж помогите пожалуйста​

Answer 1

1.

$\frac{72}{80}-(x-\frac{12}{80})=\frac{15}{80} \\x-\frac{12}{80}=\frac{72}{80}-\frac{15}{80} \\x-\frac{12}{80}=\frac{57}{80}\\x=\frac{57}{80}+\frac{12}{80} \\x=\frac{69}{80}$

2.

$x+\frac{7}{50}=\frac{3}{50}+\frac{27}{50}\\x+\frac{7}{50}=\frac{30}{50}\\x=\frac{30}{50}-\frac{7}{50} \\\\x=\frac{23}{50}$