求初中水平60道十字相乘法解方程练习题 简单点
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(1)2x2-5x-12; (2)3x2-5x-2;
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2.
(1)4n2+4n-15; (2)6a2+a-35;
(3)5x2-8x-13; (4)4x2+15x+9
(5)15x2+x-2; (6)6y2+19y+10;
(7)20-9y-20y2; (8)7(x-1) 2+4(x-1)(y+2)-20(y+2)
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2.
(1)4n2+4n-15; (2)6a2+a-35;
(3)5x2-8x-13; (4)4x2+15x+9
(5)15x2+x-2; (6)6y2+19y+10;
(7)20-9y-20y2; (8)7(x-1) 2+4(x-1)(y+2)-20(y+2)
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