Раскройте скобки и упростите : 1.2(3-x)-(8+x)=... 2.-4(y+5)+(12-y)=... 3.-(-7-x)+4(x-5)=... 4.-9(y-4)-(12+y)=...

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Ответы и объяснения

2013-04-02T14:57:03+00:00

12(3-x)-(8+x) = 6x-2x-8-x=2-3x

2-4(y+5)+(12-y) = -4y-20+12-y = -5y-8

3-(-7-x)+4(x-5) = 7+x+4x-20 = 5x-13

4-9(y-4)-(12+y) = -9y+36-12+y=24-8y