(2x+5y)(3x-2y)-2x(x-3y)
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(2x+5y)(3x-2y)-2x(x-3y)
(2x+5y)(3x-2y)-2x(x-3y)
(2x+5y)(3x-2y)-2x(x-3y)
22分乘然后减啊,13.14.23.24这样各乘
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