Question

1. tính bằng cách hợp lí :

a. 5 . 125 . 2 . 41 . 8 =                                                 c. 8 . 12 . 125 . 2 =

b. 25 . 7 . 10 . 4 =                                                         d. 4 . 36. 25 . 50 =

Answer 1

a) 5 . 125 . 2 . 41 . 8

= (5 . 8) . (125 . 2) . 41

= 40 . 250 . 41

= 10 000 . 41

= 410 000

b) 25 . 7 . 10 . 4

= (25 . 4 ) . (10 . 7)

= 100 . 70

= 7000

Chúc bạn học tốt!! ^^

Answer 2

a,5.125.2.41.8=(125.8).(2.5).41=1000.10.41=410000

b,25.7.10.4=(25.4).70=100.70=7000

c,8.12.125.2=(8.125).12.2=100.24=2400

d,4.36.25.50=(4.25).(2.50).18=100.100.18=180000

Answer 3

c) 8 . 12 . 125

= (125 . 8) . 12

= 1000 . 12

= 12 000

d) 4 . 36 . 25 . 50

= (25 . 4) . (50 . 36)

= 100 . 1800

= 180 000

Chúc bạn học tốt!! ^^

Answer 4

a: \(5\cdot125\cdot2\cdot41\cdot8=1000\cdot10\cdot41=410000\)

b: \(25\cdot7\cdot10\cdot4=100\cdot10\cdot7=7000\)

c: \(8\cdot12\cdot125\cdot2=1000\cdot24=24000\)

e: \(4\cdot36\cdot25\cdot50=100\cdot50\cdot36=180000\)