计算 (2y-3)(y+4) (-5x+2)∧2 (2x-3y)(2x+3y) (2x-5)(x-2)-(-4+3x)(3x+4)
问题描述:
计算 (2y-3)(y+4) (-5x+2)∧2 (2x-3y)(2x+3y) (2x-5)(x-2)-(-4+3x)(3x+4)
(2y-3)(y+4)
(2x-3y)(2x+3y)
(-5x+2)∧2
(2x-5)(x-2)-(-4+3x)(3x+4)
(t+5)∧2-(5-t)∧2
答
(2y-3)(y+4)=2y²+5y-12(2x-3y)(2x+3y)=4x²-9y²(-5x+2)∧2 =25x²-20x+4(2x-5)(x-2)-(-4+3x)(3x+4)=2x²-9x+10-9x²+16=-7x²-9x+26(t+5)∧2-(5-t)∧2=t²+10t+25-t...