F.1數學...Literal Equations

方法一：通分母
x/a+x/b = 1
xb/ab + xa/ab = 1
(xb + xa)/ab = 1
xb + xa = ab
x(b+a) = ab
x = ab/(b+a)

方法一：全式乘ab
x/a+x/b = 1
ab(x/a+x/b) = ab
xb+xa = ab
x(b+a) = ab
x = ab/(b+a)

x/a+x/b=1
(x/a+x/b)ab=ab
bx+ax=ab
x(a+b)=ab
x=ab/(a+b)

bx+ax/ab=1
x(b+a)/ab=1
x(b+a)=ab
x=ab/(b+a)