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1
(2x²+xy-y²)-(4x-5y)-6
=(2x-y)(x+y)-(4x-5y)-6
=(2x-y+2)(x+y-3)
2
(3x²+5xy-2y²)+(x+9y)-4
=(3x-y)(x+2y)+(x+9y)-4
=(3x-y+4)(x+2y-1)
3
a+b=-c
a+c=-b
b+c=-a
=((a+c)/b)+((a+b)/c)+((b+c)/a)
=-3
4
x³-3x²+4
=(x³-2x²)-(x²-4)
=x²(x-2)-(x-2)(x+2)
=(x²-x-2)(x-2)
=(x-2)²(x+1)
(2x²+xy-y²)-(4x-5y)-6
=(2x-y)(x+y)-(4x-5y)-6
=(2x-y+2)(x+y-3)
2
(3x²+5xy-2y²)+(x+9y)-4
=(3x-y)(x+2y)+(x+9y)-4
=(3x-y+4)(x+2y-1)
3
a+b=-c
a+c=-b
b+c=-a
=((a+c)/b)+((a+b)/c)+((b+c)/a)
=-3
4
x³-3x²+4
=(x³-2x²)-(x²-4)
=x²(x-2)-(x-2)(x+2)
=(x²-x-2)(x-2)
=(x-2)²(x+1)
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紧号什么意思
追答
好吧 看不懂的符号全是平方
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