计算 1.(x-4y)(2x+3y)-(x+2y)(x-y) 2.(-0.5*9/7)2009次方*(2*7/9)2008次方计算 1.(x-4y)(2x+3y)-(x+2y)(x-y)2.(-0.5*9/7)2009次方*(2*7/9)2008次方3.(2x+y+3z)(2x+y-3z)
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