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A, 210x13+210x65/28x104
=210x(13+65)/28x4x26
=210x78/28x22x26
=210x78/210x26
=78/26
=3
b, (1+2+3+...+100)x(12+22+32+...+102)x(65x111-13.15.37)
=(1+2+3+...+100)x(12+22+..+102)x(7215-7215)
=(1+2+..+100)x(12+22+..+102)x0
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Ta có: 770:[ ( 20x+10 ):x ] = 35
=>(20x+10):x =770:35
=>(20x+10):x =22
=>20x+10=22x
=>20x+10=20x .2x
=>10=2x
=>x=10:2
=.x=5
b,Ta có: 5x+15-2x=65
=>5x-2x+15=65
=>3x+15=65
=>3x=50
x=50/3
Chúc bạn làm bài tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a,
M = 10.22 - 67 : 65
M = 10.4 - 62
M = 40 - 36
M = 4
b,
\(x\) - 20 = 5.(-10)
\(x\) - 20 = -50
\(x\) = -50 + 20
\(x\) = - 30
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a, 1230 : 3(x – 20) = 10
3(x – 20) = 123
x – 20 = 41
x = 61
b, 250 – 10.(24 – 3x):15 = 244
10.(24 – 3x):15 = 6
10.(24 – 3x) = 90
24 – 3x = 9
3x = 15
x = 5
c, 4 x 3 + 15 = 47
4 x 3 = 32
x 3 = 8 = 2 3
x = 2
d, 65 - 4 x + 2 = 2014 0
65 - 4 x + 2 = 1
4 x + 2 = 64 = 4 3
x + 2 = 3
x = 1
e, 4 . 2 x - 3 = 125
4 . 2 x = 128
2 x = 32 = 2 5
x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x⋮10,x⋮20\) tức x chia hết cho 30
55 < x < 65
= > x = 60
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2^{10}.13.2^{10}\cdot65\)
\(=1024.13.1024.65\)
\(=886046720\)
\(2^8.104\)
\(=256.104\)
\(=26624\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\frac{5^{10}.78}{5^8.104}=\frac{25.3}{4}=\frac{75}{4}=18,75\)
a) x - 10 = - 65
x = -65 + 10
x = -55
a) x - 10 = - 65
x = (-65) + 10
x = - ( 65-10 )
x= -55
Chấm điểm cho mình nha, chúc bạn học tốt!