(39+240+180+15):4=?
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a 180 -(x + 15) : 4 =80:5 180 - (x + 15) : 4 = 16 180 - ( x + 15) = 16 x 4 180 - ( x + 15 ) = 64 x + 15 = 180 - 64 x + 15 = 116 x= 116 - 15 x = 101
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 180 : (18.5) = 180 :90 = 2
b, 240 : (2.3.4) = 240 : 24 = 10
c, (15.18.24) : ( 5.9.12)
= 6480 : 540 =12
d, ( 27 + 45 + 18 + 81) : 9
= 3 + 5 + 2 + 9 = 19
![](https://rs.olm.vn/images/avt/0.png?1311)
Cần:
\(240:\left(180:15\right)=240:12=20\left(xe\right)\)
1 ô tô chuyển được số tấn hàng là:
180 : 15 = 12 (tấn)
Muốn vận chuyển 240 tấn hàng thì cần số ô tô là:
240 : 12 = 20 (ô tô)
Đ/S: 20 ô tô
Hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{3}{10}\)
b) \(\dfrac{9}{28}\)
c) \(\dfrac{88}{195}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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nen ko lam duoc
chuc bnhoc tot
nhae$
++++
a) 240=24.3.5
180=22.32.5
=> ƯCLN(240;180)=22.3.5=60
=> ƯC(240;180)=Ư(60)= 1;2;3;4;5;6;10;12;15;20;30;60.
b) 320=26.5
720=24.32.5
560=24.5.7
=> ƯCLN(320;720;560)= 24.5=80
=>ƯC(320;720;560)=Ư(80)=1;2;4;8;10;20;40;80
![](https://rs.olm.vn/images/avt/0.png?1311)
180 : ( 18 x 5 )
= 180 : 90
= 2
b) 240 : ( 2 x 3 x 4 )
= 240 : 24
= 10
c) 4400 : ( 22 x 35 )
= 4400 : 770
= \(\dfrac{40}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(84=2^2\cdot3\cdot7;180=2^2\cdot3^2\cdot5;240=2^4\cdot3\cdot5\)
=>\(ƯCLN\left(84;180;240\right)=2^2\cdot3=12\)
Ta có: \(84⋮x;180⋮x;240⋮x\)
=>\(x\inƯC\left(84;180;240\right)\)
=>\(x\inƯ\left(12\right)\)
=>\(x\in\left\{1;-1;2;-2;3;-3;4;-4;6;-6;12;-12\right\}\)
mà x>6
nên x=12
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1) - 135 - 2017 + 9 x 15
= - 135 - 2017 + 135
= ( - 135 + 135 ) - 2017
= 0 - 2017
= - 2017
2) - 39 x ( 250 - 87 ) - 61 x ( 240 + 97 )
= - 39 x 163 - 61 x 337
= - 6357 - 20557
= - 26914
3) 65 + 135 - 35 + 9 x 35
= 65 + 135 - 35 + 315
= ( 65 + 315 ) + ( 135 - 35 )
= 380 + 100
= 480
4) - 15 x ( 23 + 157 ) + 15 x 157 - 15 x 7
= 15 x ( - 180 ) + 15 x 157 - 15 x 7
= 15 x ( - 180 + 157 - 7 )
= 15 x ( - 30 )
= - 450