问题标题：
分式的乘除计算要完整的过程（1）b/a.a/c（2）x²-4y²/3xy³.xy/x+2y(3)3y/10x.6y²/2x²(4)x/x²-1.x²+x/x²
问题描述：
分式的乘除计算要完整的过程（1）b/a.a/c
（2）x²-4y²/3xy³.xy/x+2y(3)3y/10x.6y²/2x²(4)x/x²-1.x²+x/x²
盛津芳回答：
(1）b/a.a/c
=(b×a)/(a×c)
=b/c
（2）x²-4y²/3xy³.xy/x+2y
=(x+2y)(x-2y)(xy)/(3y²)(xy)(x+2y)
=(x-2y)/3y²
(3)3y/10x.6y²/2x²
=(3y.6y²)/(10x.2x²)
=9y³/10x³
(4)x/x²-1.x²+x/x²
=x.x(x+1)/(x+1)(x-1)x²
=1/(x-1)
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