初二约分题目求助~要写详细点,如最简公分母等,最好按照课本书来 ^后面是次方 12ab/-18b^3 a^2-6a+9/a^2-9 2x(x-y)^3/4y(x-y)^2 x^2-(y-z)^2/(x+y)^2-z^2不写最简公分母
问题描述：
初二约分题目求助~
要写详细点,如最简公分母等,最好按照课本书来
^后面是次方
12ab/-18b^3
a^2-6a+9/a^2-9
2x(x-y)^3/4y(x-y)^2
x^2-(y-z)^2/(x+y)^2-z^2
不写最简公分母
答
12ab/-18b^3=6B(2A)/[6B(-3B方)]=-2A/3B方a^2-6a+9/a^2-9 =(A-3)方/[(A+3)(A-3)]=(A-3)/(A+3)2x(x-y)^3/4y(x-y)^2 =2(X-Y)方*X(X-Y)/[2(X-Y)方*2Y]=(X方-XY)/2Yx^2-(y-z)^2/(x+y)^2-z^2=(X+Y-Z)(X-Y+Z)/[(X+Y-X)(X+Y...