分式乘除的计算1.(-n^2/2m)*(4m^2/5n^3)2.(y/7x)/(-2/x)3.-8xy/(2y/5x)4.(a^2-4)/(a^2-2a+1)*(a^2-1)/(a^2-1/a^2+4a+4)5.(5b^2/3ac)/(-10bc/21a)6.(12xy/5a)/(-8x^2y)7.(x^2-x/x-1)/(4-x)*号为乘号
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![分式乘除的计算1.(-n^2/2m)*(4m^2/5n^3)2.(y/7x)/(-2/x)3.-8xy/(2y/5x)4.(a^2-4)/(a^2-2a+1)*(a^2-1)/(a^2-1/a^2+4a+4)5.(5b^2/3ac)/(-10bc/21a)6.(12xy/5a)/(-8x^2y)7.(x^2-x/x-1)/(4-x)*号为乘号](/uploads/image/z/2766844-28-4.jpg?t=%E5%88%86%E5%BC%8F%E4%B9%98%E9%99%A4%E7%9A%84%E8%AE%A1%E7%AE%971.%28-n%5E2%2F2m%29%2A%284m%5E2%2F5n%5E3%292.%28y%2F7x%29%2F%28-2%2Fx%293.-8xy%2F%282y%2F5x%294.%28a%5E2-4%29%2F%28a%5E2-2a%2B1%29%2A%28a%5E2-1%29%2F%28a%5E2-1%2Fa%5E2%2B4a%2B4%295.%285b%5E2%2F3ac%29%2F%28-10bc%2F21a%296.%2812xy%2F5a%29%2F%28-8x%5E2y%297.%28x%5E2-x%2Fx-1%29%2F%284-x%29%2A%E5%8F%B7%E4%B8%BA%E4%B9%98%E5%8F%B7)
分式乘除的计算1.(-n^2/2m)*(4m^2/5n^3)2.(y/7x)/(-2/x)3.-8xy/(2y/5x)4.(a^2-4)/(a^2-2a+1)*(a^2-1)/(a^2-1/a^2+4a+4)5.(5b^2/3ac)/(-10bc/21a)6.(12xy/5a)/(-8x^2y)7.(x^2-x/x-1)/(4-x)*号为乘号
分式乘除的计算
1.(-n^2/2m)*(4m^2/5n^3)
2.(y/7x)/(-2/x)
3.-8xy/(2y/5x)
4.(a^2-4)/(a^2-2a+1)*(a^2-1)/(a^2-1/a^2+4a+4)
5.(5b^2/3ac)/(-10bc/21a)
6.(12xy/5a)/(-8x^2y)
7.(x^2-x/x-1)/(4-x)
*号为乘号
分式乘除的计算1.(-n^2/2m)*(4m^2/5n^3)2.(y/7x)/(-2/x)3.-8xy/(2y/5x)4.(a^2-4)/(a^2-2a+1)*(a^2-1)/(a^2-1/a^2+4a+4)5.(5b^2/3ac)/(-10bc/21a)6.(12xy/5a)/(-8x^2y)7.(x^2-x/x-1)/(4-x)*号为乘号
1.(-n^2/2m)*(4m^2/5n^3)
=-4m^2n^2/(10mn^3)
=-2m/(5n)
2.(y/7x)/(-2/x)
=xy/(-14x)
=-y/14
3.-8xy/(2y/5x)
=-40x^2y/2y
=-20x^2
4.(a^2-4)/(a^2-2a+1)*(a^2-1)/(a^2-1/a^2+4a+4)
=(a+2)(a-2)(a+1)(a-1)/[(a-1)^2(a+2)^2]
=(a-2)(a+1)/(a-1)(a+2)
=(a^2-a-2)/(a^2+2a-2)
5.(5b^2/3ac)/(-10bc/21a)
=(105ab^2)/(-30abc^2)
=-7b/(2c^2)
6.(12xy/5a)/(-8x^2y)
=12xy/(-40ax^2y)
=-3/(10ax)
7.(x^2-x/x-1)/(4-x)
=x(x-1)/[(x-1)(4-x)
=x/(4-x)