问题补充:
数学题(用十字相乘法)3a^2-7a-66x^2-11xy+3y4m^2+8mn+3n^210x^2-21xy+2y^28m^2-22mn+15n^2(一小时内再加财富)(十字写出)
答案:
=(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)
======以下答案可供参考======
供参考答案1:
=(3a+2)(a-3)
=(3x-1)(2x-3)
=(2m+n)(2m+3n)
=(10x-y)(x-2y)
=(4m-5n)(2m-3n)
供参考答案2:
easy,1;(a-3)(3a+2)
2: (2x-3y)(3x-y)
3 (m+3n)(4m-n)
4(x-2y)(10x-y)
5(2m-3n)(4m-5n)第2题楼上错了
供参考答案3:
按顺序=(3a+2)(a-3)
=(3x-1)(2x-3)
=(2m+n)(2m+3n)
=(10x-y)(x-2y)
=(4m-5n)(2m-3n)