Question

Thực hiện phép tính theo cách hợp lý 

a, 3 + 2387 : 77 - 33

b, 8 x 33 x 25 x 125 x 4

c, 20,16 : 0,01

Answer 1

a/  3 + 2387 : 77 - 33 

= 3 + 31 - 33

= 31 + ( 3 - 33)

= 31 + (-30)

= 1

b/ 8 x 33 x 25 x 125 x 4

= (8 x 125) x (4 x 25) x 33

= 1000 x 100 x 33

= 100000x 33

= 3300000

c/ 20, 16 : 0,01

= 2016 : 1

= 2016

Answer 2

Thêm : 

D, 8,6 - 2,75

E, 4\(\frac{3}{8}\)+ 5\(\frac{2}{3}\)

F, 3\(\frac{1}{5}\)- 1\(\frac{1}{5}\)+ \(\frac{2}{5}\)

G, \(\frac{2}{5}\)+ \(\frac{3}{5}\): \(\frac{4}{5}\)

H, \(\frac{5}{2}\)x \(\frac{1}{3}\)+ \(\frac{1}{4}\)