谁给我四道十字相差方式的计算题,随便什么题目,无限制,请先出计算全过程
来源:百度知道 编辑:UC知道 时间:2024/06/02 07:24:22
x^2+5x+6=0
解答x
将x的平方拆成,6拆成2乘以3
x +2
x +3
所以变成(x+2)(x+3)=0
所以x=-2,-3
10x^2-37x+33=0
28x^2-71x+45=0
15x^2+31x-24=0
22x^2-25x-12=0
x^-2x-8=(x-4)(x+2)
x^2-2x-3=(x-3)(x+1)
x^2+6x+5=(x+1)(x+5)
2x^2-5x+2=(2x-1)(x-2)
(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)
(1) 12x^2+10xy-12x+5y-9
(2) 2y^2-ay-3by-a^2+b^2
(3) x^3+(2a+1)^2+(a^2+2a-1)
(4)a^2+b^2-2ab-2a+2b