1) 4(9+7х)+21=393 2) 486: (5х+2)=18 3) 5(14+b)+6b=158 - вопрос №19223661497213932486521835146158 от xcp4 17.11.2020 05:58

Question

Математика: 1) 4(9+7х)+21=393 2) 486: (5х+2)=18 3) 5(14+b)+6b=158

xcp4 · Answer

1)    4(9+7х)+21=39336+28х+21=39328х=393-36-2128х=336х=336:28х=122)   486:(5х+2)=1897.5х+243=1897.5х=18-24397.5х=-225х=-2.33)   5(14+b)+6b=15870+5b+6b=1585b+6b=158-7011b=88b=8...