文档介绍：乘法公式练****题1.(2004·青海)下列各式中,相等关系一定成立的是()A.(x-y)2=(y-x)2B.(x+6)(x-6)=x2-6C.(x+y)2=x2+(x-2)+x(2-x)=(x-2)(x-6)2.(2003·泰州)下列运算正确的是()+x2=·a3=a5C.(-2x2)4=16x6D.(x+3y)(x-3y)=x2-3y23.(2003·河南)下列计算正确的是()A.(-4x)·(2x2+3x-1)=-8x3-12x2-4xB.(x+y)(x2+y2)=x3+y3C.(-4a-1)(4a-1)=1-16a2D.(x-2y)2=x2-2xy+4y24.(x+2)(x-2)(x2+4)的计算结果是()+16B.-x4----1991×1993的计算结果是().-.-,能整除代数式(n+3)(n-3)-(n+2)(n-2)的整数是().()(5a+1)=1-25a2,(2x-3)=4x2-9,(-2a2-5b)()=4a4-×101=()()=.9.(x-y+z)(-x+y+z)=[z+()][]=z2-()+kx+25是另一个多项式的平方,则k=.11.(a+b)2=(a-b)2+,a2+b2=[(a+b)2+(a-b)2](),a2+b2=(a+b)2+,a2+b2=(a-b)2+..(1)(a+b)2-(a-b)2;(2)(3x-4y)2-(3x+y)2;(3)(2x+3y)2-(4x-9y)(4x+9y)+(2x-3y)2;(4)++×;(5)(x+2y)(x-y)-(x+y)+n2-6m+10n+34=0,求m++a1=4,求a2+21a和a4+(t+58)2=654481,求(t+84)(t+68)(1-3x)2+(2x-1)2>13(x-1)(x+1).=1990x+1989,b=1990x+1990,c=1990x+1991,求a2+b2+c2-ab-ac-.(2003·郑州)如果(2a+2b+1)(2a+2b-1)=63,求a+(a+b)2=60,(a-b)2=80,求a2+(x+y)+(2x+21?y)+(3x+32?y)+…+(9x+98?y),并求当x=2,y=(x)=2x-1(如f(-2)=2×(-2)-1,f(3)=2×3-1),求2003)2003()2()1(fff????:12+(1×2)2+22=(1×2+1)222+(2×2)2+32=(2×3+1)232+(3×4)2+42=(3×4+1)2……(1)写出第2005个式子;(2)写出第n个式子,-5a2x+3-2a2+-1100+-yz-(x-y)x-y10.±-2ab2ab12.(1)原式=4ab;(2)原式=-30