Question

1、a²/b乘以b/a= （） （2）a÷b乘以1/b=（）

Answer 1

a a/b^2 b/a÷b/2a^2=b/a*2a^2/b=2a ac²/3b^3*9b/a²c=ac²*9b/3b^3*a^2c=3c/a -b/7xy²÷14ab/x²y=-(b*x^2 y/7xy^2*14ab)=-(x/98a) x²+xy/x*1/x+y=x*(x+y)/x*(x+y)=1

（xy-x²）÷x-y/xy=[（xy-x²）/1]*xy/x-y=x(y-x)*xy/(x-y)=-x^2 y

要写很多,懒得算了