Question

1/ a) 3+\(\frac{2}{5}\)       b) 4-\(\frac{5}{7}\)        c)  1-(\(\frac{2}{5}+\frac{1}{3}\))          d) 4x\(\frac{3}{8}\)      e) 3:\(\frac{1}{2}\)    \(\frac{1}{2}:3\)  

2/ 1 tam bai hinh chu nhat co chieu dai \(\frac{1}{2}\)m, chieu rong \(\frac{1}{3}\)m . chia tam bia do thanh3 phan bang nhau. tinh dien tich moi phan

Answer 1

Diện tích mỗi phần là:

1/2x1/3:3=1/18 (m2)

Đáp số:1/18 m2

Answer 2

\(3+\frac{2}{5}=\frac{15}{5}+\frac{2}{5}=\frac{17}{5}\)

\(4-\frac{5}{7}=\frac{28}{7}-\frac{5}{7}=\frac{23}{7}\)

\(1-\left(\frac{2}{5}+\frac{1}{3}\right)=1-\frac{11}{15}=\frac{4}{15}\)

\(4\times\frac{3}{8}=\frac{12}{8}=\frac{3}{2}\)

 

Answer 3

3+2/5=15/5+2/5=17/5

4-5/7=28/7-5/7=23/7

1-(2/5+1/3)=1-11/15=4/15

4x3/8=12/8=3/2

3:1/2=3/1:1/2=3/1x2/1=6/1=6

1/2:3=1/2:3/1=1/2x1/3=1/6