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Calculati va rog!!!!
1/5y-2/3y=7/25

1/5y+5/9y=7.2

Răspuns :

Ignatovvlad201
a)75×1/5y-75×2/3y=75×7/25
15y-25×2y=3×7
15y-50y=21
-35y=21
y=-21/35
y=-3/5.
b)1/5y+5/9y=72/10
1/5y+5/9y=36/5
45×1/5y+45×5/9y=45×36/5
9y+5×5y=9×36
9y+25y=324
34y=324
y=324/34, y=162/17.

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