(2x-7)(x-1)+(2x-3)(2x+3) 2(x-8)(x-5)-(2x-1)(x+2) 3x(3y-x)-(4x-3y)_数学解答

(2x-7)(x-1)+(2x-3)(2x+3) 2(x-8)(x-5)-(2x-1)(x+2) 3x(3y-x)-(4x-3y)(x+3y)
(2-b)(3+b)-(2-b)(2+b)
1.(2x-7)(x-1)+(2x-3)(2x+3)
2.2(x-8)(x-5)-(2x-1)(x+2)
3.3x(3y-x)-(4x-3y)(x+3y)

人气：324 ℃　时间：2020-04-23 09:05:54

解答

1.(2x-7)(x-1)+(2x-3)(2x+3)=2x²-9x+7+4x²-9=6x²-9x-22.2(x-8)(x-5)-(2x-1)(x+2)=2(x²-13x+40)-(2x²+3x-2)=2x²-26x+80-2x²-3x+2=-29x+823.3x(3y-x)-(4x-3y)(x+3y)=9xy-3x²-...