计算 (2y-3)(y+4) (-5x+2)∧2 (2x-3y)(2x+3y) (2x-5)(x-2)-(-4+3x)(
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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
(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
(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-t²+10t-25
=20t
=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-t²+10t-25
=20t
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