Question

15. Tính nhanh:

a,\(\frac{3\cdot4\cdot5}{10\cdot2\cdot6}\)       b,\(\frac{6\cdot8\cdot12\cdot16}{4\cdot12\cdot8\cdot6}\)                     

Answer 1

a , \(\frac{3.4.5}{10.2.6}=\frac{3.2.2.5}{5.2.2.3.2}=\frac{1}{2}\)

b , \(\frac{6.8.12.16}{4.12.8.6}=\frac{6.8.12.4.4}{4.12.8.6}=4\)

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Answer 2

a,1/2          b,4

Answer 3

\(a.\frac{3\cdot4\cdot5}{10\cdot2\cdot6}=\frac{3\cdot2\cdot2\cdot5}{2\cdot5\cdot2\cdot3\cdot2}=\frac{\left(3\cdot2\cdot2\cdot5\right)\div\left(3\cdot2\cdot2\cdot5\right)}{\left(2\cdot5\cdot2\cdot3\cdot2\right)\div\left(3\cdot2\cdot2\cdot5\right)}=\frac{1}{2}\)

Answer 4

a, \(\frac{3.4.5}{10.2.6}\)= \(\frac{3.2.2.5}{5.2.2.3.2}\)= \(\frac{1}{2}\)

b, \(\frac{6.8.12.16}{4.12.8.6}\)= \(\frac{6.8.12.4.4}{4.12.8.6}\)= 4

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Answer 5

a, \(\frac{3.4.5}{10.2.6}\)= \(\frac{3.2.2.5}{5.2.2.3.2}\)= \(\frac{1}{2}\)

b, \(\frac{6.8.12.16}{4.12.8.6}\)=\(\frac{6.8.12.4.4}{4.12.8.6}\)=\(4\)