先化简式子 x分之x²-y²÷(x-x分之2xy-y²)再求值,其中,x=2,y=-1)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 02:33:25
![先化简式子 x分之x²-y²÷(x-x分之2xy-y²)再求值,其中,x=2,y=-1)](/uploads/image/z/1122202-10-2.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%BC%8F%E5%AD%90+x%E5%88%86%E4%B9%8Bx%26%23178%3B-y%26%23178%3B%C3%B7%EF%BC%88x-x%E5%88%86%E4%B9%8B2xy-y%26%23178%3B%EF%BC%89%E5%86%8D%E6%B1%82%E5%80%BC%2C%E5%85%B6%E4%B8%AD%2Cx%3D2%2Cy%3D-1%29)
先化简式子 x分之x²-y²÷(x-x分之2xy-y²)再求值,其中,x=2,y=-1)
先化简式子 x分之x²-y²÷(x-x分之2xy-y²)再求值,其中,x=2,y=-1)
先化简式子 x分之x²-y²÷(x-x分之2xy-y²)再求值,其中,x=2,y=-1)
x分之(x²-y²)÷[x- x分之(2xy-y²)]
=x分之(x²-y²)÷[ x分之(x²-2xy+y²)]
=x分之(x+y)(x-y) * [(x-y)²分之x]
=(x-y)分之(x+y)
=(2+1)分之(2-1)
=3分之1
你这样写谁看得懂?
(X²-Y²)/X÷(X-(2XY-Y²)/X)
=(X²-Y²)/X÷(X²-2XY-Y²)/X
=(X-Y)(X+Y)/X÷(X-Y)²/X
=(X+Y)/(X-Y)
带入数值得
原式=(2-1)/(2+1)
=1/3
这是我在静心思考后得出的结...
全部展开
(X²-Y²)/X÷(X-(2XY-Y²)/X)
=(X²-Y²)/X÷(X²-2XY-Y²)/X
=(X-Y)(X+Y)/X÷(X-Y)²/X
=(X+Y)/(X-Y)
带入数值得
原式=(2-1)/(2+1)
=1/3
这是我在静心思考后得出的结论,
如果能帮助到您,希望您不吝赐我一采纳~(满意回答)
如果不能请追问,我会尽全力帮您解决的~
答题不易,如果您有所不满愿意,请谅解~
收起