1)5(x-4)=x+8 2)9-7(x+3)=5-6x 3)(7x+-7)=8 4)0,4(6-4t)=1,9-0,5(3t-7) - вопрос №42362111548297356377840464190537 от maximkolosov66 14.07.2020 05:10

Question

Алгебра: 1)5(x-4)=x+8 2)9-7(x+3)=5-6x 3)(7x+-7)=8 4)0,4(6-4t)=1,9-0,5(3t-7)

maximkolosov66 · Answer

1)5х-20=х+8  5х-х=8+20  4х=28  х=72)9-7х+21=5-6х  -7х+6х=5-9-21  -х=-35  х=353)7х+9-11х+7=8  7х-11х=8-9-7  -4х=-8  х=24)2,4-1.6t=1.9-1.5t+3.5  -1.6t+1.5t=3.5+1.9-2.4  -0.1t=3  t=-30...