(2x-7)(x-1)+(2x-3)(2x+3)=?怎么计算呀!

问题描述:

(2x-7)(x-1)+(2x-3)(2x+3)=?怎么计算呀!

展开运算:(2x-7)(x-1)+(2x-3)(2x+3) =2x^2-9x+7+4x^2-9 =6x^2-9x-2