Số cần tìm là:
1/2+1/3-1/4=7/12
Đáp số:7/12
\(\frac{1}{2}+\frac{1}{3}-\frac{1}{4}=\frac{3}{6}+\frac{2}{6}-\frac{1}{4}=\frac{5}{6}-\frac{1}{4}=\frac{10}{12}-\frac{3}{12}=\frac{7}{12}\)
1/2+1/3-1/4 = 6/12 + 4/12 -3/12 = 7/12
MSC la 12
1/2=6/12;1/3=4/12;1/4=3/12
VẬY;1/2+1/3+1/4=6/12+4/12+3/12
=13/12nha ban