12/3+x=45/3
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 38 giờ 24 phút
b)17 giờ 41 phút 12 giây
c) 25 phút 21 giây
d) 2 phút 49 giây
![](https://rs.olm.vn/images/avt/0.png?1311)
`= 12 xx 45 + 12 xx 15 + 12 xx 30`
`= 12 xx (45+15+30)`
`= 12 xx 90`
`= 1080`.
![](https://rs.olm.vn/images/avt/0.png?1311)
) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 3/5 x 5 + 12 x 3/5 + 3 : 5/3
= 3/5 x 5 + 12 x 3/5 + 3 x 3/5
= 3/5 x ( 5 + 15 + 3)
= 3/5 x 20
= 12
b. 3/5 x 45/27 x 135/180
= 3/5 x 5/3 x 3/4
= 1 x 3/4
= 3/4
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(70-\left(x-3\right)=45\)
\(x-3=70-45\)
\(x-3=25\)
\(x=25+3\)
\(x=28\)
b) \(12+\left(5+x\right)=20\)
\(5+x=20-12\)
\(5+x=8\)
\(x=8-5\)
\(x=3\)
c) \(130-\left(100+x\right)=25\)
\(100+x=130-25\)
\(100+x=105\)
\(x=105-100\)
\(x=5\)
d) \(175+\left(30-x\right)=200\)
\(30-x=200-175\)
\(30-x=25\)
\(x=30-25\)
\(x=5\)
e) \(\left(x+12\right)+22=92\)
\(x+12=92-22\)
\(x+12=70\)
\(x=70-12\)
\(x=58\)
f) \(95-\left(x+2\right)=45\)
\(x+2=95-45\)
\(x+2=50\)
\(x=50-2\)
\(x=48\)
a)
70 - (x - 3) = 45
x - 3 = 70 - 45 = 25
x = 25 + 3 = 28
Vậy x = 28
b)
12 + (5 + x) = 20
5 + x = 20 - 12 = 8
x = 8 - 5 = 3
Vậy x = 3
c)
130 - (100 + x) = 25
100 + x = 130 - 25 = 115
x = 115 - 100 = 15
Vậy x = 15
d)
175 + (30 - x) = 200
30 - x = 200 - 175 = 25
x = 30 - 25 = 5
Vậy x = 5
e)
(x + 12) + 22 = 92
x + 12 = 92 - 22 = 70
x = 70 - 12 = 58
Vậy x = 58
f)
95 - (x + 2) = 45
x + 2 = 95 - 45 = 50
x = 50 - 2 = 48
Vậy x = 48
![](https://rs.olm.vn/images/avt/0.png?1311)
12 + 34 + 56 + 78 + 123 + 99 + 322 + 199 = 1223
12 x 45 x 67 x 89 x 0 = 0
12 : 4 : 3 x 9 : 3 x 1259 = 3777
Tk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(45\cdot y-30=12\cdot15-40\cdot3\)
\(\Rightarrow45\cdot y-30=180-120\)
\(\Rightarrow45\cdot y-30=60\)
\(\Rightarrow45\cdot y=60+30\)
\(\Rightarrow45\cdot y=90\)
\(\Rightarrow y=90:45\)
\(\Rightarrow y=2\)
\(\Leftrightarrow45y-30=60\Leftrightarrow45y=90\Leftrightarrow y=2\)
x=45/3-12/3
x=33/3
x=11
con điên