Решите уравнения x-0.7=4x-10. 5×(13-2x)=-19-3x. -5(0.8y-2.4)=-y+14.4

Question

Решите уравнения x-0.7=4x-10. 5×(13-2x)=-19-3x. -5(0.8y-2.4)=-y+14.4

Answer 1

Х-4х=0.7-10
-3х=-9.3
Х=3.1
____
65-10х=-19-3х
-10х+3х=-19-65
-7х=-84
Х=12
-4у+12=-у+14,4
-4у+у=-12+14.4
-3у=2.4
У=-0.8

Answer 2

 x-0.7=4x-10
x-4x=0.7-10
-3x=-9.3
x=-9.3/(-3)
x=3.1