(相关资料图)
1、(1)(x²+1)²-4x²(2)(2x-y)²-2(2x-y)+1(3)(x+y)²-2(x²-y²)+(x-y)² (4)(a+1)(a+5)+4(5)(m²+n²)²-4m²n²(6) x²+2x+1-y²(7) -4x^2+12xy-9y^2(8) 9(2a-b)^2-6(2a-b)+1(9) -2m^3+24m^2-72m(10) -x^4+2x^2y^2-y^4(11) (x+y)^2+4(x-y)^2-4(x^2-y^2)(12) (a^2+1)^2-4a^2 (13) y^n+1 -3y^n +2y^n-1(14) (x^2+3x+4)^2 +(x^2+3x+4)-6(15) -(x-y)^3-4(x-y)^2+12(x-y)(a-b)^2,(a-1)^2(X-1/2)^2(Y+1/3)^2(2X+1)^2(2X-3Y)^2(1/2X+2Y)^2(a-3/2)^2(2a-3)^2(-X-Y)^2(-X+2Y)^2(X-Y)^2+(X+Y)^2(X+Y)^2-(X-Y)^2(2X-1/2Y^2)^22(X^2-3Y)^23(1/2X+1/3)^2(X-2Y)^2+(2X+Y)^24(X-3Y)^2+24(X+Y)^2(X+1)^2+(X-1)^2+(X-3)^2+(X+2)^2(XY-1)^21. (a+2b) (a-2b) = ( ) 2-( ) 2= 2. ( ) 2-( ) 2= 3. (2x+y) 2= (3a-4)2= 4. (-5x+2y) 2= (-a-3b) 2= 5. (mn- ) ( -) =6. (3x+ ) 2= +12xy+ 7.102×98= ( ) ( ) = ( ) 2-( ) 2= 1.(4x-3y)2 =(4x)2-2(4x)·(3y)+(3y)2 =16x2-24xy+9y2. 2.(-4xy+ab)2 =(-4xy)2+2(-4xy)·(ab)+(ab)2 =16x2y2-8abxy+a2b2 3.10.32=(10+0.3)2 =100+6+0.09=106.09. 4.(x-2y+3z)2 =x2+(-2y)2+(3z)2+2·x·(-2y)+2·x· (3z)+2·(-2y)·(3z) =x2+4y2+9z2-4xy+6xz-12yz.。
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