96cm=96/100m=24/25m

72kg=72/1000 tấn =9/125 tấn

324m=324/1000km=81/250km

1, \(\frac{5}{12}=\frac{15}{36};\frac{7}{18}=\frac{14}{36}\)

2, 96cm = \(\frac{96}{100}=\frac{24}{25}m\)

   72kg =\(\frac{72}{1000}=\frac{9}{125}\)tấn

  324m = \(\frac{324}{1000}=\frac{81}{250}\)km

3, Mảnh vải đỏ dài hơn

a Đã lấy \(\frac{7}{10}\)tấm vải

  Còn \(\frac{3}{10}\)tấm vải

4, \(\frac{1}{3}< \frac{1}{2}< \frac{2}{3}\)

5, \(\frac{5}{13}\times\frac{4}{15}\times13=\frac{4}{3}\)

    \(\left(\frac{3}{7}+\frac{7}{5}\right)\times\frac{7}{5}=\frac{64}{25}\)

1 ) \(\frac{15}{36};\frac{14}{36}\)

2 ) \(\frac{96}{100}\)m = \(\frac{24}{25}\)m

72kg = \(\frac{72}{1000}\)tấn = \(\frac{9}{125}\)tấn

324 m = \(\frac{324}{1000}=\frac{81}{250}\)tấn 

3 ) So Sánh \(\frac{5}{8}\)với \(\frac{4}{5}\)

Quy đồng mẫu số : = \(\frac{25}{40}\)và \(\frac{32}{40}\)

=> mảnh vải đỏ dài hơn 

75kg=.0,075..tấn

45kg=.0,45..tạ

56m=.0,056..km

75 dm² =.0,75..m²

75 kg  = 0.075 tấn

45 kg = 0.45 tạ

56 m = 0.056 km

75 dm² = 0.75 m²

2/3

4

\(\dfrac{13}{15}-\dfrac{1}{5}=\dfrac{13}{15}=\dfrac{3}{15}=\dfrac{10}{15}=\dfrac{2}{3}\)

\(\dfrac{7}{8}\times\dfrac{2}{7}=\dfrac{14}{56}=\dfrac{1}{4}\)

a .   x : 1 2 = 4 x = 4   x   1 2 x   =   2

b .   x   × 3 5 = 15 x   =   15 : 3 5 x = 25

b .   x   × 3 5 = 15

\(\frac{7}{15}+\frac{2}{10}=\frac{14}{30}+\frac{6}{30}=\frac{20}{30}=\frac{2}{3}\)

\(\frac{8}{3}+\frac{4}{3}=\frac{12}{3}=\frac{4}{1}=4\)

a, \(\frac{7}{15}+\frac{2}{10}=\frac{2}{3}\)

b,\(\frac{8}{3}+\frac{4}{3}=4\)

\(x:\dfrac{1}{8}=\dfrac{6}{11}\\ x=\dfrac{6}{11}\times\dfrac{1}{8}\\ x=\dfrac{3}{44}\)

3/44

a) \(x:\frac{1}{2}=4\)

\(x=4\times\frac{1}{2}\)

\(x=2\)

b)\(x\times\frac{3}{5}=15\)

\(x=15:\frac{3}{5}\)

\(x=25\)

a) \(\text{X}\div\frac{1}{2}=4\)

\(\text{X}=4\times\frac{1}{2}\)

\(\text{X}=2\)

b) \(\text{X}\times\frac{3}{5}=15\)

\(\text{X}=15\div\frac{3}{5}\)

\(\text{X}=25\)