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/759395-11-5.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)
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)
(x-4y)(2x+3y)-(x+2y)(x-y)
=2x²+3xy-8xy-12y²-(x²-xy+2xy-2y²)
=2x²-5xy-12y²-(x²+xy-2y²)
=2x²-5xy-12y²-x²-xy+2y²
=x²-6xy-10y²
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