Question

решить уравнение 72 / 80 - x - 12 и 80 равно 15,80
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Answer 1

$\tt\displaystyle\frac{72}{80}-\bigg(x-\frac{12}{80}\bigg)=\frac{15}{80}$

$x-\tt\displaystyle\frac{12}{80}=\frac{72}{80}-\frac{15}{80}$

$x-\tt\displaystyle\frac{12}{80}=\frac{57}{80}$

$x=\tt\displaystyle\frac{57}{80}+\frac{12}{80}$

$x=\tt\displaystyle\frac{69}{80}$