18.5 x ( 2.32 + 5.48 ) - 6.8

= 18.5 x 7.8 - 6.8

= 144.3 - 6.8

= 137.5

7/5 + 8/3 :2

= 7/5 + 8/3 *1/2

= 7/5 + 4/3

= 28/15 +20/15

= 48/15 = 16/5

3/8 * 4/9 = 2/3

\(18,5.\left(2,32+5,48\right)-6,8\)

\(=18,5.7,8-6,8\)

\(=144,3-6,8=137,5\)

\(\frac{7}{5}+\frac{8}{3}:2\)

\(=\frac{7}{5}+\frac{4}{3}=\frac{21}{15}+\frac{20}{15}\)

\(\frac{3}{8}.\frac{4}{9}=\frac{1}{6}\)

18,5 x ( 2,32 + 5,48 ) - 6,8

= 18,5 x 7,8 - 6,8

= 144,3 - 6,8

= 137,5

7/5 + 8/3 :2

= 7/5 + 8/3 x1/2

= 7/5 + 4/3

= 28/15 +20/15

= 48/15 = 16/5

3/8 x 4/9 = 2/3

a/  36 460  + 22 478  = 58 938

b/  5486   -   3450   = 20 36

c/  5445   :   9    = 65

d/   3254   x   4     = 13 016

a: 658,4+86,95=745,35

b: 36,9-15,47=21,43

c: 21,5*5,6=120,4

d: 14,26:6,2=2,3

Phép đầu là 45,63

a, 19,48 + 26 ,15 = 45,63

b, 62,05 - 20 , 18 = 41,87

c, 4,06 x 3,4 = 13,804

d, 91,08 : 3,6 = 25,3

thank

7/5+4/5   7/20-1/4         5/4x3/9      7/2 : 8

=7+4/5    =7/20-5/20      =5/4x1/3    =7/2x 1/8

=11/5       =7-5/20          =5/12         =7/16

                 = 1/10 

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