Раскройте скобки:
1) 2*(5-х-у)
2) (-3)*(а+10-b)
Раскройте скобки и упростите выражение:
1) 4*(5-y)-30
2) -8*(9+x)+50
3) 20+3(x-15)
4) 16-4(2+a)
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