1) 2.9y-4(1.2-y)=5.4 (y+2) 2)3/4x - (3/4-2x)= 1 1/2 - вопрос №7393548129412542234342112 от Lagunahey 07.11.2020 09:27

Question

Математика: 1) 2.9y-4(1.2-y)=5.4 (y+2) 2)3/4x - (3/4-2x)= 1 1/2 + x

Lagunahey · Answer

2.9y-4(1.2-y)=5.4 (y+2)2,9у-4,8+4у=5,4у+10,82,9у+4у-5,4у=10,8+4,81,5у=15,6у=15,6:1,5у=10,43/4x - (3/4-2x)= 1 1/2 + x3/4х - 3/4 + 2х = 3/2 + х3/4х + 2х - х = 3/2+3/43/4х + х = 6/4+3/41 3/4х = 9/47/4х = 9/4х= 9/4 : 7/4х= 9/4 * 4/7х= 9/7 = 1 1/7...