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,整式易错点复习,1.计算填空:,(1)m5(m4)=_,(2)m5(m)4=_,(3)(1-x)5(x-1)4=_,(4)(1-x)5(x-1)3=_,(6)(-x3y4)3=_,(5)(-x3y4)4=_,2.判断,有错误的改错:,(1)(a2)3=(-a3)2,(4)(ab)3(b-a)2=(a-b)5,(3)(a+b)2=a2+b2,(2)(a-b)2=a2-b2,(1)(2a+1)2 -(2a+1)(2a-1),(2)(2m+3n)2 - (2m-3n)2,3.计算,(3)x2+y2-(x-y)2+2y(x-y)4y,4.解答,(1)已知xa=4,xb=9,求xa+2b的值。,(2)已知am=5,a2n=7,求a3m-4n的值。,5.填空,(1)若a2+b2=0,则a=_;b=_,1变:若(a+1)2+(b-2)2=0,则a=_;b=_,2变:若a2+2a+1+b2-4b+4=0,则a=_;b=_,3变:若a2+2a+b2-4b+5=0,则a=_;b=_,4变:若a2+b2-4a-4b+8=0,则a=_;b=_,6.一个角的补角比它的余角的2倍还大180,求这个角。,