.把下列各式分解因式:(说明下,圈圈里的数字是次方,比如3次方是③,这可以按V+2打出){1}x(a+b)+y(a+b) {2}3a(x-y)-(x-y) {3}6(p+q)②-12(q+p){4}a(m-2)+b(2-m) {5}2(y-x)②+3(x-y) {6}mn(m-n)-m(n-m)②{7}7(a-1)+x(a-1) {8}3(a-b)

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