(1) (3x-2y)(y-3x)-(2x-y)(3x+y) (2) (3x+2y+4)(5x-2y-1) 计算
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(1) (3x-2y)(y-3x)-(2x-y)(3x+y) (2) (3x+2y+4)(5x-2y-1) 计算
(1) (3x-2y)(y-3x)-(2x-y)(3x+y) (2) (3x+2y+4)(5x-2y-1) 计算
(1) (3x-2y)(y-3x)-(2x-y)(3x+y) (2) (3x+2y+4)(5x-2y-1) 计算
①原式=3xy-9x^2-2y^2+6xy-6x^2-2xy+3xy+y^2=-15x^2-y^2+10xy
②原式=15x^2-6xy-3x+10xy-4y^2-2y+20x-8y-4=15x^2-4y^2+4xy+17x-10y-4
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