Question

1.Tính 

        \(a,5\text{x}\dfrac{7}{3}\)                 \(b,\dfrac{13}{4}:7\)

2.Tính

   \(a,\dfrac{3}{7}+\dfrac{2}{5}+\dfrac{3}{4}\)     \(b,\dfrac{9}{7}-\dfrac{5}{11}\text{x}\dfrac{11}{7}\)      \(c,\dfrac{3}{5}\text{x}\dfrac{5}{7}\text{+}\dfrac{4}{7}\)      \(d,\dfrac{7}{9}\text{x}\dfrac{2}{5}:\dfrac{3}{11}\)   e,\(\dfrac{9}{7}+\dfrac{2}{3}-\dfrac{1}{4}\)

                       g,\(\dfrac{4}{9}:\dfrac{3}{5}\text{x}\dfrac{2}{11}\)      h,\(\dfrac{7}{2}-\dfrac{3}{10}:\dfrac{2}{5}\)

Answer 1

\(a,5x\dfrac{7}{3}=\dfrac{5}{1}x\dfrac{7}{3}=\dfrac{35}{3};b,\dfrac{13}{4}:7=\dfrac{13}{4} :\dfrac{7}{1}=\dfrac{13}{4}x\dfrac{1}{7}=\dfrac{13}{28}\)

Answer 2

\(\dfrac{3}{7}+\dfrac{2}{5}+\dfrac{3}{4}=\dfrac{60}{140}+\dfrac{56}{140}+\dfrac{105}{140}=\dfrac{221}{140}\)

Answer 3

\(\dfrac{9}{7}-\dfrac{5}{11}x\dfrac{11}{7}=\dfrac{9}{7}-\dfrac{5}{7}=\dfrac{4}{7}\)

Answer 4

\(\dfrac{3}{5}x\dfrac{5}{7}+\dfrac{4}{7}=\dfrac{3}{7}+\dfrac{4}{7}=\dfrac{7}{7}=1\)

Answer 5

\(\dfrac{7}{9}x\dfrac{2}{5}:\dfrac{3}{11}=\dfrac{14}{45}:\dfrac{3}{11}=\dfrac{14}{45}x\dfrac{11}{3}\dfrac{154}{135}\)

Answer 6

\(\dfrac{9}{7}+\dfrac{2}{3}-\dfrac{1}{4}=\dfrac{41}{21}-\dfrac{1}{4}=\dfrac{164}{84}-\dfrac{21}{84}=\dfrac{143}{84}\)

Answer 7

1. Tính 

\(a,5\times\dfrac{7}{3}=\dfrac{35}{3}\)

\(b,\dfrac{13}{4}:7=\dfrac{13}{4}\times\dfrac{1}{7}=\dfrac{13}{28}\)

2. Tính

\(a,\dfrac{3}{7}+\dfrac{2}{5}+\dfrac{3}{4}\)

\(=\dfrac{15}{35}+\dfrac{14}{35}+\dfrac{3}{4}\)

\(=\dfrac{29}{35}+\dfrac{3}{4}\)

\(=\dfrac{116}{140}+\dfrac{105}{140}\)

\(=\dfrac{221}{140}\)

\(b,\dfrac{9}{7}-\dfrac{5}{11}\times\dfrac{11}{7}\)

\(=\dfrac{9}{7}-\dfrac{55}{77}\)

\(=\dfrac{99}{77}-\dfrac{55}{77}\)

\(=\dfrac{44}{77}=\dfrac{4}{7}\)

\(c,\dfrac{3}{5}\times\dfrac{5}{7}+\dfrac{4}{7}\)

\(=\dfrac{3}{5}\times\left(\dfrac{5}{7}+\dfrac{4}{7}\right)\)

\(=\dfrac{3}{5}\times\dfrac{9}{7}\)

\(=\dfrac{27}{35}\)

\(d,\dfrac{7}{9}\times\dfrac{2}{5}:\dfrac{3}{11}\)

\(=\dfrac{14}{45}:\dfrac{3}{11}\)

\(=\dfrac{14}{45}\times\dfrac{11}{3}\)

\(=\dfrac{154}{135}\)

\(e,\dfrac{9}{7}+\dfrac{2}{3}-\dfrac{1}{4}\)

\(=\dfrac{27}{21}+\dfrac{14}{21}-\dfrac{1}{4}\)

\(=\dfrac{41}{21}-\dfrac{1}{4}\)

\(=\dfrac{164}{84}-\dfrac{21}{84}\)

\(=\dfrac{143}{84}\)

\(g,\dfrac{4}{9}:\dfrac{3}{5}\times\dfrac{2}{11}\)

\(=\dfrac{4}{9}\times\dfrac{5}{3}\times\dfrac{2}{11}\)

\(=\dfrac{20}{27}\times\dfrac{2}{11}\)

\(=\dfrac{40}{297}\)

\(h,\dfrac{7}{2}-\dfrac{3}{10}:\dfrac{2}{5}\)

\(=\left(\dfrac{7}{2}-\dfrac{3}{10}\right):\dfrac{2}{5}\)

\(=\left(\dfrac{35}{10}-\dfrac{3}{10}\right):\dfrac{2}{5}\)

\(=\dfrac{32}{10}:\dfrac{2}{5}\)

\(=\dfrac{16}{5}\times\dfrac{5}{2}\)

\(=\dfrac{80}{10}=8\)

Answer 8

\(\dfrac{4}{9}:\dfrac{3}{5}x\dfrac{2}{11}=\dfrac{20}{27}x\dfrac{2}{11}=\dfrac{40}{297}\)

Answer 9

\(\dfrac{7}{2}-\dfrac{3}{10}:\dfrac{2}{5}=\dfrac{7}{2}-\dfrac{3}{4}=\dfrac{11}{4}\)

Answer 10

Bài 1:

a,5\(\times\)\(\dfrac{7}{3}\)=\(\dfrac{5\times7}{3}=\dfrac{35}{3}\)              b,\(\dfrac{13}{4}:7\)=\(\dfrac{13}{4\times7}\)=\(\dfrac{13}{28}\)

Bài 2:

a,\(\dfrac{3}{7}+\dfrac{2}{5}+\dfrac{3}{4}\)=\(\dfrac{221}{140}\)                b,\(\dfrac{9}{7}-\dfrac{5}{11}\times\dfrac{11}{7}\)=\(\dfrac{4}{7}\)

c,\(\dfrac{3}{5}\times\dfrac{5}{7}+\dfrac{4}{7}=1\)                   d,\(\dfrac{7}{9}\times\dfrac{2}{5}:\dfrac{3}{11}=\dfrac{154}{135}\)

e,\(\dfrac{9}{7}+\dfrac{2}{3}-\dfrac{1}{4}=\dfrac{143}{84}\)

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