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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![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)](/uploads/image/z/1260689-41-9.jpg?t=%E8%AE%A1%E7%AE%97+1.%EF%BC%88x-4y%EF%BC%89%EF%BC%882x%2B3y%EF%BC%89-%EF%BC%88x%2B2y%EF%BC%89%EF%BC%88x-y%EF%BC%89+2.%EF%BC%88-0.5%2A9%2F7%EF%BC%892009%E6%AC%A1%E6%96%B9%2A%EF%BC%882%2A7%2F9%EF%BC%892008%E6%AC%A1%E6%96%B9%E8%AE%A1%E7%AE%97+1.%EF%BC%88x-4y%EF%BC%89%EF%BC%882x%2B3y%EF%BC%89-%EF%BC%88x%2B2y%EF%BC%89%EF%BC%88x-y%EF%BC%892.%EF%BC%88-0.5%2A9%2F7%EF%BC%892009%E6%AC%A1%E6%96%B9%2A%EF%BC%882%2A7%2F9%EF%BC%892008%E6%AC%A1%E6%96%B93.%EF%BC%882x%2By%2B3z%EF%BC%89%EF%BC%882x%2By-3z%EF%BC%89)
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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)
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)
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)
(-0.5*9/7)^2009*(2*7/9)^2008
=(-0.5)^2009*(9/7)^2009*(2)^2008*(7/9)^2008
=(-0.5)^2009*(2)^2008*(9/7)^2009*(7/9)^2008
=-0.5*(-0.5*2)^2008*(9/7)*[(9/7)*(7/9)]^2008
=-0.5*(9/7)
=-9/14
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