Ответ учителя по предмету Математика
7(3-2х)=15(1-х)
21-14х=15-15х
15х-14х=15-21
х=-6
проверка:
7(3-2*(-6))=15(1-(-6)
7(3+12)=15*7
105=105
ответ: х=-6
4/5у=у+4
4/5у-у=4
4/5у-5/5у=4
-1/5у=4
-0,2у=4
у=-20
проверка:
4/5*(-20)=-20+4
-16=-16
ответ: у=-20
6у-2 4/5=2,5у
6у-2,5у=2 4/5
3,5у=14/5
у=4/5
у=0,8
проверка:
6*0,8-2 4/5=2,5*0,8
4 4/5-2 4/5=2
2=2
ответ: у=0,8
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