Question

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        Tính nhanh :

                         a,4/5x2/9+1/5x2/9                                    b, 7/8:1/5-3/8:1/5

                         c,6/11x8/9+5/11x8/9                                 d,11/12:2/3-3/12:2/3

    

Answer 1

a,4/5x2/9+1/5x2/9  

=2/9*(4/5+1/5)

=2/9*1

=2/9

b)7/8:1/5-3/8:1/5

=(7/8-3/8):1/5

=1/2:1/5

=5/2

c)6/11x8/9+5/11x8/9

=(6/11+5/11)*8/9

=1*8/9

=8/9

d)11/12:2/3-3/12:2/3

=(11/12-3/12):2/3

=2/3:2/3

=1

Answer 2

MK sẽ giúp bn

a)\(\frac{4}{5}x\frac{2}{9}+\frac{1}{5}x\frac{2}{9}\)

\(=\left(\frac{4}{5}+\frac{1}{5}\right)x\frac{2}{9}\)

\(=1x\frac{2}{9}\)

\(=\frac{2}{9}\)

b)\(\frac{7}{8}:\frac{1}{5}-\frac{3}{8}:\frac{1}{5}\)

\(=\left(\frac{7}{8}-\frac{3}{8}\right):\frac{1}{5}\)

\(=\frac{5}{8}:\frac{1}{5}\)

\(=\frac{25}{8}\)

c)\(\frac{6}{11}x\frac{8}{9}+\frac{5}{11}x\frac{8}{9}\)

\(=\left(\frac{6}{11}+\frac{5}{11}\right)x\frac{8}{9}\)

\(=\frac{8}{9}x1\)

\(=\frac{8}{9}\)

d)\(\frac{11}{12}:\frac{2}{3}-\frac{3}{12}:\frac{2}{3}\)

\(=\left(\frac{11}{12}-\frac{3}{12}\right):\frac{2}{3}\)

\(=\frac{2}{3}:\frac{2}{3}\)

\(=1\)

Answer 3

a,4/5 × 2/9 + 1/5 × 2/9                                     b, 7/8 : 1/5 - 3/8 : 1/5

= 2/9 × ( 4/5 + 1/5)                                              = 7/8 × 5 - 3/8 × 5

= 2/9 × 1                                                                = 5 × ( 7/8 - 3/8)

= 2/9                                                                       = 5 × 1/2 = 5/2

c,6/11 × 8/9 + 5/11 × 8/9                                  d, 11/12 : 2/3 - 3/12 : 2/3

= 8/9 × ( 6/11 + 5/11)                                          = 11/12 × 3/2 - 3/12 × 3/2

= 8/9 × 1                                                                 = 3/2 × ( 11/12 - 3/12)

= 8/9                                                                       = 3/2 × 2/3 ==1

Answer 4

a) \(\frac{4}{5}\cdot\frac{2}{9}+\frac{1}{5}\cdot\frac{2}{9}\)

\(=\frac{2}{9}\cdot\left(\frac{4}{5}+\frac{1}{5}\right)\)

\(=\frac{2}{9}\cdot1\)

\(=\frac{2}{9}\)

b) \(\frac{7}{8}:\frac{1}{5}-\frac{3}{8}:\frac{1}{5}\)

\(=\left(\frac{7}{8}-\frac{3}{8}\right):\frac{1}{5}\)

\(=\frac{1}{2}:\frac{1}{5}\)

\(=\frac{5}{2}\)

c) \(\frac{6}{11}\cdot\frac{8}{9}+\frac{5}{11}\cdot\frac{8}{9}\)

\(=\frac{8}{9}\cdot\left(\frac{6}{11}+\frac{5}{11}\right)\)

\(=\frac{8}{9}\cdot1\)

\(=\frac{8}{9}\)

d) \(\frac{11}{12}:\frac{2}{3}-\frac{3}{12}:\frac{2}{3}\)

\(=\left(\frac{11}{12}-\frac{3}{12}\right):\frac{2}{3}\)

\(=\frac{2}{3}:\frac{2}{3}\)

\(=1\)

Answer 5

A=\(\left\{\frac{4}{5}+\frac{1}{5}\right\}\times\frac{2}{9}=\frac{2}{9}\)                                                B=\(\left\{\frac{7}{8}-\frac{3}{8}\right\}:\frac{1}{5}=\frac{5}{2}\)

C=\(\left\{\frac{6}{11}+\frac{5}{11}\right\}\times\frac{8}{9}=\frac{8}{9}\)                                             C=\(\left\{\frac{11}{12}-\frac{3}{12}\right\}:\frac{2}{3}=\frac{3}{2}\)

Answer 6

Cho mik sửa lại chút: câu cuối =1. ( vit nhầm )