a) 24x2x5=(24x5)x2=120x2=240
b) 125x345x8=(125x8)x345=1000x345=345000
c) 543x2x50=543x(2x50)=543x100=54300
d) 250x564=(250x4)x141=1000x141=141000
e) 50x4x2x657=(50x2)x(4x657)=100x2628=262800
g) 698x125x8x2=(698x2)x(125x8)=1396x1000=1396000
h) 165:5-65:5=(265-65):5=100:5=20
i) 564:4+46:4=(564+46):4=610:4=152,5
a) 24.2.5
= 24.(2.5)
= 24.10
= 240
b) 125.345.8
= (125.8).345
= 1000.345
= 345000
c) 543.2.50
= 543.(2.50)
= 543.100
= 54300
d) 250.564
= 50.5.141.4
= (50.4).5.141
= 200.5.141
= 1000.141
= 141000
e) 50.4.2.657
= (50.2).(4.657)
= 100.2628
= 262800
g) 698.125.8.2
= (125.8).(698.2)
= 1000.1396
= 1396000
h) 165:5-65:5
= (165-65):5
= 100:5
= 20
i) 564:4+46:4
= (564+46):4
= 610:4
= 125,5
k) 486:9+10:9
= (486+10):9
= 496:9
= 55,11
l) 876:6-36:6
= (876-36):6
= 840:6
= 140
m) 27.33+33.73
= 33.(27+73)
= 33.100
= 3300
n) 72.105-105.22
= 105.(72-22)
= 105.50
= 5250
o) 25.35+35.74+35
= 25.35+35.74+35.1
= 35.(25+74+1)
= 35.100
= 3500
p) 135.99+135
= 135.99+135.1
= 135.(99+1)
= 135.100
= 13500
q) 265.45-164.45-45
= 265.45-164.45-45.1
= 45.(265-164-1)
= 45.100
= 4500
r) 86.65+65.13+65
= 86.65+65.13+65.1
= 65.(86+13+1)
= 65.100
= 6500
CHÚC BẠN HỌC TỐT~
