Question

Tính nhanh

d) 66.25 + 5.66 + 66.14 + 33.66 

i) 136.23 + 136.17 – 40.36 e) 12.35 + 35.182 – 35.94 

j) 17.93 + 116.83 + 17.23 

m) 19.27 + 47.81 + 19.20

Answer 1

66(25+5+14+33)

66.77=5082

Answer 2

136(23+17)-40.36

=136.40-40.36

=40(136-36)

=40.100=4000

Answer 3

35(12+182-94)

35.100=3500

Answer 4

17(93+23)+116.83

=17.116+116.83

=116(17+83)

=116.100=11600

Answer 5

d) 66.25 + 5.66 + 66.14 + 33.66 = 66 . ( 25 + 5 + 14 +33 ) = 66 . 77 = 5082

i) 136.23 + 136.17 – 40.36 = 136 . (23 + 17) -40.36 = 136. 40 - 40 . 36 = 40 (136-36) = 40 . 100 = 4 000

e) 12.35 + 35.182 – 35.94 =35.(12 +182-94) = 35 . 100 = 3 500

j) 17.93 + 116.83 + 17.23 = 17. ( 93+23) +116.83 = 17 . 116 + 116 . 83 = 116. (17 + 83 ) = 116 . 100 = 11 600

m) 19.27 + 47.81 + 19.20 = 19.(27+20) + 47.81 = 19 . 47 + 47 . 81 = 47. (19 + 81) = 47 .100 = 4 700

Answer 6

19.(27+20)+47.81

=19.47+47.81

=47(19+81)

=47.100=4700