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a ) 2 x 3 x 5 x 7
= ( 2 x 5 ) x 3 x 7
= 10 x 21
= 210
b ) 50 x 9 x 9 x 2
= ( 50 x 2 ) x 9 x 9
= 100 x 81
= 8100
c ) 13 x 25 x 3 x 4
= ( 25 x 4 ) x 13 x 3
= 100 x 39
= 3900
d ) 7 x 125 x 7 x 8
= ( 125 x 8 ) x 7 x 7
= 1000 x 49
= 49000
e ) 25 x 32 x 125
= 800 x 125
= 100000
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125 x 1975 x 4 x 8 x 25 = (125 x 8) x (25 x 4) x 1975 = 1000 x 100 x 1975 = 197500000
125 x 1975 x 4 x 8 x 25
= (125 x 8) x (25 x 4) x 1975
= 1000 x 100 x 1975
= 1975 x 100000
= 197500000
Nhấn đúng cho mk nha!!!!
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TL :
5 . 5 : 25 . 5 . 5 . 5 : 125 - 1
= 52 : 25 . 53 : 125 - 1
= 1 . 53 : 125 - 1
= 125 : 125 - 1
= 1 - 1
= 0
_HT_
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25 - (20 - 10)=15
80 - (30 + 25)=25
125 + (13 + 7)=145
416 - (25 - 21)=412
(65 + 15) x 2=160
46 : (6 : 3)=23
(74 - 14) : 2=30
81 : (3 x 3)=9
123 x (42 - 40)=246
(100 + 11) x 9=999
72 : (2 x 4)=9
64 : (8 : 4)=32
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a.
a,550 : 5 x 8
=110 x 8
=880
b,946 - 606 : 3
=946-202
=744
c,(285 + 60) : 5 x 8
=345:5x8
=69 x8
=552
d,735 : (3 + 2) - 50
=147 -50
=97
e,105 + 82 : 2
=105+41
=146
g,420 x 2 - 120
=840-120
=720
h,6 x (25 + 125)
=6 x150
=900
i,150 + 25 x 3
=150+75
=225
a. 550 : 5 x 8 = 880. b. 946 - 606 : 3 = 643. c. (285 + 60) : 5 x 8 = 552. d. 735 : (3 + 2) - 50 = 97.
e. 105 + 82 : 2 = 146. g. 420 x 2 - 120 = 720. h. 6 x (25 + 125) = 900. i. 150 + 25 x 3 = 225.
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a) 125.3+125.125.6
=125.3+125.750
=125.(3+750)
=125.753
=94125
b) (245.99+245)-(145.101-145)
=(245.(99+1))-(145.(101-1))
=245.100-145.100
=(245-145).100
=100.100
=10000
c) 154.(28+52)-45.(26+54)
=154.80-45.80
=(154-45).80
=109.80
=8720
a) 125x3+125+125x6
=125x(3+1+6)
=125x10
=1250
b) (245x99+245)-(145x101-145)
=(245x99+245)-(145x100)
=(245x100)-14500
=24500-14500
10000
c) 154x80-45x80
=80x(145-45)
=80x100
=8000
X x x25 = 125
X = 125 : 25
X = 5
Xx 25=125
X= 125 :25
X =25 ai k mk mk k lai