3/7(0.56-4.9y)-6/13(0.52-3.9y)=0.6. Created by dayanamaniv. matematika-ru

13(0.52-3.9y)=0.6...

3/7(0.56-4.9у)-6/13(0.52-3.9у)=0.6

0.24-2.1у-0.24+1.8у=0.6

-0.3у=0.6

у=0.6:(-0.3)

у=-2

$\frac{3}{7}\cdot(0,56-4,9y)-\frac{6}{13}\cdot(0,52-3,9y)=0,6$

$0,24-2,1y-0,24+1,8y=0,6$

$-0,3y=0,6$

$y=0,6:(-0,3)$

$y=-2$

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$\frac{3}{7}\cdot(0,56-4,9\cdot(-2))-\frac{6}{13}\cdot(0,52-3,9\cdot(-2))=0,6$ (это проверка)

$\frac{3}{7}\cdot(0,56+9,8)-\frac{6}{13}\cdot(0,52+7,8)=0,6$

$\frac{3}{7}\cdot10,36-\frac{6}{13}\cdot8,32=0,6$

$4,44-3,84=0,6$

$0,6=0,6$