括号X -1×括号2X +1-2×括号X -5×括号X +12等于多少?

2025-04-07 14:00:43
推荐回答(1个)
回答1:

(x-1)(2x+1)-2(x-5)(x+12)
=2x²+x-2x-1-2(x²+12x-5x-60)
=2x²-x-1-2x²-24x+10x+120
=-15x+119