раскройте скобки и упростите выражение 1)(x+2,3)-(x+7.8) 2)-(7.2-y)+(-y+1.6) 3)-(y-7.4+x)-(11.6-y) 4)(-2.6+x+y)-(x-y-2.6)
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2)-(7.2-y)+(-y+1.6)=-7,2+у-у+1,6=-5,6
3)-(y-7.4+x)-(11.6-y)=-у+7,4-х-11,6+у=-х-4,2
4)(-2.6+x+y)-(x-y-2.6)=-2,6+х+у-х+у+2,6=2у