Question

tính:

a).2/3x4/7

8/21:2/3

8/21:4/7

4/7x2/3

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Answer 1

a)2/3x4/7=8/21

b)8/21:2/3=8/21x3/2=24/42=4/7

c)8/21:4/7=8/21x7/4=56/85=7//12

d)4/7X2/3=8/21

Answer 2

a)\(\frac{2}{3}\cdot\frac{4}{7}=\frac{8}{21}\)

b)\(\frac{8}{21}:\frac{2}{3}=\frac{8}{21}\cdot\frac{3}{2}=\frac{4}{7}\)

c)\(\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\cdot\frac{7}{4}=\frac{2}{3}\)

d)\(\frac{4}{7}\cdot\frac{2}{3}=\frac{8}{21}\)

Answer 3

2/3 x 4/7 = \(\frac{2.4}{3.7}=\frac{8}{21}\)

\(\frac{8}{21}:\frac{4}{7}=\frac{8\times7}{21\times4}=\frac{56}{84}=\frac{2}{3}\)

\(\frac{8}{21}:\frac{2}{3}=\frac{8\times3}{21\times2}=\frac{24}{42}=\frac{4}{7}\)

\(\frac{4}{7}\times\frac{2}{3}=\frac{4\times2}{7\times3}=\frac{8}{21}\)

Answer 4

a,\(\frac{2}{3}x\frac{4}{7}=\frac{8}{21}\)

b,\(\frac{8}{21}:\frac{2}{3}=\frac{4}{7}\)

c,\(\frac{8}{21}:\frac{4}{7}=\frac{2}{3}\)

d,\(\frac{4}{7}x\frac{2}{3}=\frac{8}{21}\)