分解因式:2x²+xy-y²-4x+5y-6我前面会分,后面“-4x+5y-6”就不会啦,
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 20:17:08
x){b⧳<~,
5eCskJJSפB۴RYħ/.zgP }@Σ90>ݰɎ^tlI0tKlh
<*jUVjjThWjYBۨB(Qm]"S~nLEJ@jHii"bJk$Ak~O'Ybd<ٻ ^O;V?VakcctΊgV>fD==@g^,oy}&Peìg"Y
Z/
分解因式:2x²+xy-y²-4x+5y-6我前面会分,后面“-4x+5y-6”就不会啦,
分解因式:2x²+xy-y²-4x+5y-6
我前面会分,后面“-4x+5y-6”就不会啦,
分解因式:2x²+xy-y²-4x+5y-6我前面会分,后面“-4x+5y-6”就不会啦,
2x²+xy-y²-4x+5y-6
=(2x-y)(x+y)-4x+5y-6
=(2x-y)(x+y)+2x+2y-6x+3y-6
=(2x-y)(x+y)+2(x+y)-3(2x-y)-6
=[(2x-y)(x+y)+2(x+y)]-[3(2x-y)+6]
=(2x-y+2)(x+y)-3(2x-y+2)
=(2x-y+2)(x+y-3)
-(Y+X-3)(y-2x-2),你分别取x=1,2,3,在给y来因是分解,在找规律,这是通法