1、(5s-2)-2(s2-s-4)-(a2b-ab2+a3)+(-4a2b-4ab2)- (3mn+4m2-5n2)+(- mn-5m2+)(4a3-a2b+4)- (a2b+1)-3(x3-y3-)-4(x3+y3-)b2-(3a2-2b2)+4b23x+(5x-8)-( +1)-2(ab+4a2)+(6ab-4a2)5a2- (4ab-3a2)-7ab-4(b-3)+2(-b-2)(x2-y)+ (x-y2)- (x2-y2)-(-x+2y)-( x-3y)(3s+1)+3(s2-s+4)-2(a2b+ab2+a3)+(-2a2b-4ab2)- (2mn+5m2+5n2)+(- mn+3m2
2、+)(a3-a2b+5)- (a2b+1)-2(x3-y3-)-2(x3-y3-)8b2-(5a2+2b2)-2b2x+(4x-4)-( -4)-5(ab-3a2)+(6ab-4a2)5a2+ (2ab-a2)-7ab-(b+1)-2(-b+3)(x2-y)- (x-y2)+ (x2-y2)-(-x+3y)-( x-3y)(2s+1)+4(s2-s+3)-2(a2b-ab2-a3)-(-4a2b-2ab2)- (4mn+5m2+4n2)+(- mn-4m2+)(4a3+a2b-2)- (a2b+6)-2(x3-y3+)-4(x3+y3-)4b2-(4a2-6b2)+b27x+(4x-3)-(
3、+1)-3(ab-5a2)+(4ab-2a2)2a2- (ab-3a2)-4ab-(b-1)+4(-b+2)-(-x+y)-( x-y)(4s+3)-2(s2+s+2)-(a2b-ab2-a3)-(-4a2b-2ab2)- (4mn-5m2-4n2)+(- mn-3m2-)(4a3+a2b-5)- (a2b+1)-2(x3-y3+)+2(x3-y3+)3b2-(4a2+6b2)+3b24x+(x-3)-( +1)-5(ab-a2)-(4ab-a2)3a2- (ab-4a2)-3ab-3(b+3)-4(-b-3)(2s-1)-2(s2-s-3)-(a2b-ab2-a3)-(-2a2b+4ab2)
4、- (5mn+5m2-3n2)+(- mn+2m2-)(a3-a2b-2)+ (a2b-5)-4(x3+y3+)-2(x3-y3+)7b2-(5a2+3b2)+b26x+(2x-6)-( +5)-5(ab+5a2)+(5ab-4a2)4a2- (2ab+6a2)-5ab-(b+4)-5(-b+3)-(-x+4y)-( x-y)(2s+4)+3(s2-s-3)-2(a2b+ab2-a3)+(-3a2b-3ab2)- (4mn-5m2+2n2)-(- mn-3m2+)(a3-a2b-2)- (a2b-1)-4(x3-y3+)-3(x3+y3-)b2-(5a2-b2)+4b23x+(2x-9)-( +3)-3(ab-a2)+(6ab-2a2)2a2+ (3ab+3a2)-6ab-2(b-2)-3(-b+3)(x2-y)- (x-y2)+ (x2+y2)-(-x+3y)-( x-2y)(3s-3)-4(s2+s+2)-3(a2b+ab2+a3)-(-2a2b+4ab2)- (3mn-4m2+2n2)+(-mn+3m2-)(a3-a2b-1)+ (a2b+3)-3(x3+y3+)-4(x3-y3+)