(X4-X2-4)(X4+X2-4)+10等于多少?

问题描述:

(X4-X2-4)(X4+X2-4)+10等于多少?

(4x-2x-4)(4x+2x-4)+10 =(2x-4)(6x-4)+10 =12x-8x-24x+16+10 =12x-32x+26 =2(6x-16x+13)