5(x-4)=x+8 9-7(x+3)=5-6x (7x+-7)=8 0.9x-7,4=-0,4x+4,3 - вопрос №5119806548973567780974044358160318 от svetlana50036 26.02.2021 12:58

Question

Математика: 5(x-4)=x+8 9-7(x+3)=5-6x (7x+-7)=8 0.9x-7,4=-0,4x+4,3 5,8-1,6x=0,3x-1,8

svetlana50036 · Answer

1) 5*х -5*4=х+85х-х=8+204х=28х=28/4; х=72)9-7х -21=5-6х-7х+6х=5+21-9х=173) 7х+9-11х+7=8-4х=8-7-9х=-8:(-4)х=24)0,9х+0,4х=4,3+7,41,3х=11,7х=11,7:1,3х=95)-1,6х-0,3х=-1,8-5,8-1,9х=-7,6х=-7,6:(-1,9)х=4...