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a; 54 : 72 x 18 : 15
= 0,75 x 18 : 15
= 0,75 x 1,2
= 0,9
b, 25 : 8 x 36 : 50
= (25 : 50) x (36 : 8)
= 0,5 x 4,5
= 2,25
=
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( 5346 - 2808 ) : 54 - 6,48
= 2538 : 54 - 6,48
= 47 - 6,48
= 40,52
Chúc bạn học tốt !
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154 - 54 : 3 + 2 x ( 108 : 9 + 125 x 5 )
= 154 - 18 + 2 x ( 108 : 9 + 125 x 5 )
= 136 + 2 x ( 12 + 625 )
= 136 + 2 x 637
= 136 + 1274
= 1410
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10.213
11. 2 giờ 55 phút
12. 4 ngày 21 giờ
13.
a: 6,008
b: 4500
c: 5,628
d: 4,009
14.
a,8579 cm2
b,32,04 m2
c,187200m2
d,5,017 tấn
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14:
a: \(85.79km^2=857900000000cm^2\)
b: \(32m^24dm^2=32.04m^2\)
c: \(1872dm^2=18.72m^2\)
d: 5 tấn 17kg=5,017 tấn
13:
a: \(6dm^38cm^3=6.008dm^3\)
b: \(4.5m^3=4500dm^3\)
c: \(5628dm^3=5.628m^3\)
d: \(4m^39dm^3=4.009m^3\)
12: =108h:3+80h
=36h+80h=116h
10:
3h18p+7h21p:3
=198p:441p:3
=198p+147p=345p
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20,19*45+20,19+54*20,19
=20,19*45+20,19*1+54*20,19
=20,19*(45+1+54)
=20,19*100
=2019
75,8-7,58*3-5*7,58-7,58
=7,58*10-7,58*3-5*7,58-7,58*1
=7,58*(10-3-5-1)
=7,58*1
=7.58
\(20,19\times45+20,19+54\times20,19\)
\(=20,19\times45+20,19\times1+54\times20,19\)
\(=20,19\left(45+1+54\right)\)
\(=20,19\times100\)
\(=2019\)
\(75,8-7,58\times3-7,58\times5-7,58\)
\(=75,8\times10-7,58\times3-7,58\times5-7,58\times1\)
\(=75,8\left(10-3-5-1\right)\)
\(=75,8\times1\)
\(=75,8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm
45,65 . 73 + 22 . 45,65 + 45,65 . 54
= 45,65 . ( 73 + 22 + 54 )
= 45,65 . 149
= 6801,85