Question

Tính nhanh 1

125.98-25.46.5

136.23+136.17-40.36

27.39+27.63-2.27

 

Answer 1

125.98 - 25.46.5

= 125.98 - 25.5.46

= 125.98 - 125.46

= 125.(98 - 46)

= 125.52

= 125.4.13

= 500.13

= 6500

136.23 + 136.17 - 40.36

= 136.(23 + 17) - 40.36

= 136.40 - 40.36

= 40.(136 - 36)

= 40.100

= 4000

27.39 + 27.63 - 2.27

= 27.(39 + 63 - 2)

= 27.100

= 2700

Answer 2

a) 125 . 98 - 25 . 46 . 5

= 125 . 98 - 125 . 46

= 125 .(98 - 46)

= 125 . 52

= 6500

b) 136.23 + 136.17 - 40.36

= 136 . (23 + 17) - 40 . 36

= 136 . 40 - 40 . 36

= (136 - 36) . 40

= 100 . 40

= 4000

27.39 + 27.63 - 2.27

= 27 . (39 + 63 - 2)

= 27 . 100

= 2700