计算;1、【(x-y)²+(x+y)(x-y)】/2x
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/04/29 05:17:47
计算;1、【(x-y)²+(x+y)(x-y)】/2x
2、(a+2b-1)(a-2b+1)
2、(a+2b-1)(a-2b+1)
(1)
【(x-y)²+(x+y)(x-y)】/2x
=(x²-2xy+y²+x²-y²)/(2x)
=(2x²-2xy)/(2x)
=2x(x-y)/(2x)
=x-y
(2)
(a+2b-1)(a-2b+1)
=(a+(2b-1))(a-(2b-1))
=a²-(2b-1)²
=a²-(4b²-4b+1)
=a²-4b²+4b-1
【(x-y)²+(x+y)(x-y)】/2x
=(x²-2xy+y²+x²-y²)/(2x)
=(2x²-2xy)/(2x)
=2x(x-y)/(2x)
=x-y
(2)
(a+2b-1)(a-2b+1)
=(a+(2b-1))(a-(2b-1))
=a²-(2b-1)²
=a²-(4b²-4b+1)
=a²-4b²+4b-1
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
运用乘法公式计算:(1)(x-y)(x+y)-(2x-y)²
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
用行列式性质计算(需过程):(x,y,x+y; y,x+y,x; x+y,x,y )
利用因式分解计算1/2x(x-y)^2-1/5y(x-y)
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
计算1):(-x-y) (x+y)二次方 2)(y-x)(x-y)的三次方
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x+y)^2-(3x-2y)^2计算