十字相乘 y^2-3y-18; 2x^2-x-1; 6x^2+7x+2; 6y^2-11y-10; 6x^2+x-15; 3a^2-8a+4; 5x^2+7x-6

问题描述:

十字相乘 y^2-3y-18; 2x^2-x-1; 6x^2+7x+2; 6y^2-11y-10; 6x^2+x-15; 3a^2-8a+4; 5x^2+7x-6

(Y-6)(Y+3)=0
(2x+1)(X-1)=0
(2x-1)(3x+2)=0
(2y-5)(3y+2)=0
(2X-3)(3X+5)=0
(3a-2)(a-2)=0
(x-2)(5x+3)=0