根据乘方的意义和分式的乘法法则,可以得到(b/a)^2=b/a`b/a=b`b/a`a=b^2/a^2
1.会计算(b/a)^n(n为正整数）吗,由此你能得出分式的乘法法则吗
2.计算(-x/y)^2`(-y^2/x)^3÷(-xy^4)
人气：149 ℃ 时间：2019-12-09 18:23:15
解答
1（b/a）^n=b/a`b/a`b/a……=b`b`b……/a`a`a……=b^n/a^n
分式乘法,等于分子相乘除以分母相乘
2 原式=（-x）^2/y^2`(-y^6)/x^3÷(-xy^4)=1/x^2
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