Раскройте скобки :  1.2•(5-x-y)=... 2.(-3)•(a+10-b)=... 3.7•(x-1+y)=... 4.(-15)•(c-d-3)=... 5.4•(a-b+8)=... 6.(-12)•(-x-y+2)=...  
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