1)5(x-4)=x+8; 2)9-7(x+3)=5-6x; 3)0.4(6-4y)=0.5(7-3y)-1.9 - вопрос №1548297356304640573195537435 от 1964hade 02.04.2021 06:30

Question

Математика: 1)5(x-4)=x+8; 2)9-7(x+3)=5-6x; 3)0.4(6-4y)=0.5(7-3y)-1.9

1964hade · Answer

1)5x-20=x+8 br / 5x-x=8+20 br / 4x=28 br / x= 28:4 br / x=7 br / br / 2) 9-7x-21=5-6x br / 7x-6x=5-9+21 br / x=17 br / br / 3)2.4-0.4y=3.5-1.5y-1.9 br / -0.4y+1.5y=3.5-1.9-2.4 br / 1.1y=-0.8 br / y=-0.8:1.1 br / y=-0.72...