(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
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![(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1](/uploads/image/z/224637-69-7.jpg?t=%EF%BC%883x%26%23178%3By-xy%26%23178%3B%EF%BC%89-3%28x%26%23178%3By-2xy%26%23178%3B%29+x%3D2%E5%88%86%E4%B9%8B1+y%3D3%E5%88%86%E4%B9%8B1%EF%BC%883x%26%23178%3By-xy%26%23178%3B%EF%BC%89-3%28x%26%23178%3By-2xy%26%23178%3B%29++++++++++++x%3D2%E5%88%86%E4%B9%8B1++++y%3D3%E5%88%86%E4%B9%8B1)
(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
可以先分解因式
(3x²y-xy²)-3(x²y-2xy²)
=xy(3x-y)-xy(3x-6y)
=xy(3x-y-3x+6y)
=5xy²
把x=2分之1 y=3分之1代入
5xy²=5 *1/2 *(1/3)²=5/18