1/(x+3)=1/4+5/121/(x+3)=8/12=2/3则2(x+3)=32x+6=32x=-3x=-3/2
1/3
x+1/3=1/4+5/12x+1/3=3/12+5/12=8/12=2/3x=2/3-1/3=1/3
x+1/3=1/4+5/12x+1/3=2/3x=2/3-1/3x=1/3
X=3分之1