Question

3.Tính                                                                                                    a.1/12x 4/5                       b. 40/7 x 21/5                                                  c,9/5:4/7                           d 11/24: 44/3

Giúp mình với , mình cần gấp

 

Answer 1

lấy máy tính cầm tay mà bấm 

 

Answer 2

\(a,\dfrac{1}{12}\times\dfrac{4}{5}=\dfrac{1\times4}{12\times5}=\dfrac{1}{15}\)

\(b,\dfrac{40}{7}\times\dfrac{21}{5}=\dfrac{40\times21}{7\times5}=\dfrac{24}{1}=24\)

\(c,\dfrac{9}{5}\div\dfrac{4}{7}=\dfrac{9}{5}\times\dfrac{7}{4}=\dfrac{9\times7}{5\times4}=\dfrac{63}{20}\)

\(d,\dfrac{11}{24}\div\dfrac{44}{3}=\dfrac{11}{24}\times\dfrac{3}{44}=\dfrac{11\times3}{24\times44}=\dfrac{1}{32}\)

Answer 3

con cặk

Answer 4

\(a,\dfrac{1}{12}\times\dfrac{4}{5}=\dfrac{4}{60}=\dfrac{1}{15}\\ b,\dfrac{40}{7}\times\dfrac{21}{5}=\dfrac{5\times8\times3\times7}{7\times5}=8\times3=24\\ c,\dfrac{9}{5}:\dfrac{4}{7}=\dfrac{9}{5}\times\dfrac{7}{4}=\dfrac{63}{20}\\ d,\dfrac{11}{24}:\dfrac{44}{3}=\dfrac{11}{24}\times\dfrac{3}{44}=\dfrac{11\times3}{3\times8\times11\times4}=\dfrac{1}{8\times4}=\dfrac{1}{32}\)