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因式分解方法x2-xy+2x-y-3是x方-xy+2x-y-3,

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/17 02:54:42
因式分解方法x2-xy+2x-y-3是x方-xy+2x-y-3,
x²-xy+2x-y-3
=x(x-y)+(x-y)+x-3
=(x-1)(x-y)+x-3
=(x-1)(x-y-1)-2
x²-xy+2x+y-3
=x(x-y)-(x-y)+3(x-1)
=(x-1)(x-y)+3(x-1)
=(x-1)(x-y+3)