1. Масса вещества Задача №1
Дано               |
m(в-ва)=50г     |
m(p-pa)=800г   |
_____________|
?                     |
Задача №2

Дано              |
w=16%           |
m(p-pa)=500г  |
____________
m(в-ва)-?       |
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