(1)计算(3a-5b-4c)^2 (2)计算(3x-2y+1)(2x+3y-1) (3)因式分解(2x-3y)^2-3(2x-3y)(2x+3y)
问题描述:
(1)计算(3a-5b-4c)^2 (2)计算(3x-2y+1)(2x+3y-1) (3)因式分解(2x-3y)^2-3(2x-3y)(2x+3y)
(4)若4x^3+ay^3与2/1xy^b-2是同类项,求2a-b的值
答
(1)计算(3a-5b-4c)^2=9a²+25b²+16c²-30ab-24ac+40bc;(2)计算(3x-2y+1)(2x+3y-1)=6x²+9xy-3x-4xy-6y²+2y+2x+3y-1=6x²-6y²+5xy-x+5y-1;(3)因式分解(2x-3y)^2-3(2x-3y)(2x+3y)=(...