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①2a-(3a-2b+2)+(3a-4b-1) =( )=2a-3a+2b-2+3a-4b-1=(2-3+3)a+(2-4)b+(-2-1)=2a-2b-3②5-(1-x)-1-(x-1)=( )=5-1+x-1-x+1=4③2x-(x+3y)-(-x-y)-(x-y)=( )=2x-x+3y+x+y-x+y=x+5y
3(-ab+2a)-(3a-b) = -3ab+6a-3a+b = -3ab+3a+b 14(abc-2a)+3(6a-2abc) =14abc-28a+18a-6abc =8abc-10a 3(xy-2z)+(-xy+3z) =3xy-6z-xy+3z =2xy-3z -4(pq+pr)+(4pq+pr) = -4pq-4pr+4pq+pr = -3pr
3(-ab+2a)-(3a-b) = -3ab+6a-3a+b = -3ab+3a+b 14(abc-2a)+3(6a-2abc) =14abc-28a+18a-6abc =8abc-10a 3(xy-2z)+(-xy+3z) =3xy-6z-xy+3z =2xy-3z -4(pq+pr)+(4pq+pr) = -4pq-4pr+4pq+pr = -3pr
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