Ответ:
1) 9(7х-6)-18х= 63х-54-18х= 45х-54
4) 2,8(56-6а)-(7b-8a)-1,2= 156,8-16,8a+7b+8a-1,2= 155,6-8,8a+7b
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Ответ:
1) 9(7х-6)-18х= 63х-54-18х= 45х-54
4) 2,8(56-6а)-(7b-8a)-1,2= 156,8-16,8a+7b+8a-1,2= 155,6-8,8a+7b