计算:(1)(-7x 2 -8y 2 )?(-x 2 +3y 2 )=______;(2)(3x-2y)(y-3x)-(2x-y)(3x+y)=______
计算:(1)(-7x2-8y2)?(-x2+3y2)=______;(2)(3x-2y)(y-3x)-(2x-y)(3x+y)=______....
计算:(1)(-7x 2 -8y 2 )?(-x 2 +3y 2 )=______;(2)(3x-2y)(y-3x)-(2x-y)(3x+y)=______.
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