因式分解与配方法练习
07-24
因式分解与配方法练习
一.因式分解。
1.x2-2xy-35y2= 2.2x2-7x-15= 3.20x2-43xy+14y2=
4.18x2-19x+5= 5.6x2-13x+6= 6.5x2+4xy-28y2=
7.-35m2n2+11mn+6= 8.6+11a-35a2= 9.6-11a-35a2= 11.20x2+( )+14y2=(4x-7y)(5x-2y).
12.x2-3xy-( )=(x-7y)(x+4y).
13.x2+( )-28y2=(x+7y)(x-4y). 14.x2+( )-21y2=(x-7y)(x+3y).
15.kx2+5x-6=(3x-2)( ),k=______.
16.6x2+5x-k=(3x-2)( ),k=______.
17.6x2+kx-6=(3x-2)( ),k=______.
18.18x2-19x+5=(9x+m)(2x+n),则m=_____,n=_____.
19.18x2+19x+m=(9x+5)(2x+n),则m=_____,n=_____.
20.x4-4x3+4x2-1=_______. 21.2x2-3x-6xy+9y=________. 22.21a2x-9ax2+6xy2-14ay2=________. 23.a3+a2b+a2c+abc=________. 思考 (x+y)2+(x+m)2-(m+n)2-(y+n)2=_ ___.