Автор - dimon9000

4(0,4x-2y)+7,8x-y. еслиx-y=0,5

Ответ

Автор - jekadva
4(0,3x-2y)+7,8x-y=1,2x-8y+7,8x-y=9x-9y      0,5*9=4,5
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