数学题(用十字相乘法)3a^2-7a-66x^2-11xy+3y4m^2+8mn+3n^210x^2-21xy+2y^2
4个回答
=(3a+2)(a-3)
题目错了吧,最后是3y^2吧=(3x-y)(2x-3y)
=(2m+n)(2m+3n)
=(10x-y)(x-2y)
=(4m-5n)(2m-3n)
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