Tìm số tự nhiên \(x\), biết :
a) \(70-5.\left(x-3\right)=45\)
b) \(10+2.x=4^5:4^3\)
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A) 70 - 5 . ( x - 3 ) = 45
5 . ( x - 3 ) = 70 - 45 = 25
x - 3 = 25 : 5 = 5
x = 5 + 3
x = 8
B) 10 + 2 . x = 45 : 43
10 + 2x = 42 = 16
2x = 16 - 10 = 6
x = 6 : 2
x = 3
a,70-5.(x-3)=45
=>5.(x-3)=70-45
=>5.(x-3)=25
=>x-3=25:5
=>x-3=5
=>x=8
b,10+2x=4^5:4^3
=>10+2x=4^2
=>10+2x=16
=>2x=16-10
=>2x=6
=>x=3
a ) 70 - 5 . ( x - 3 ) = 45
5 . ( x - 3 ) = 70 - 45
5 . ( x - 3 ) = 25
x - 3 = 25 ; 5
x - 3 = 5
x = 5 + 3
x = 8
b) 10 + 2x = 45 : 43
10 + 2 x = 42
10 + 2. x = 16
2x = 16 = 10
2x = 6
x = 6 : 2
x = 3
a) 70-5(x-3)=45
5(x-3)=70-45
5(x-3)=25
x-3=25:5
x-3=5
x=5+3
x=8
vậy x=8
b)10+2x=45:43
10+2x=42
10+2x=16
2x=16-10
2x=6
x=6:2
x=3
vậy x=3
\(a.70-5.\left(x-3\right)=45\)
\(70-\left(x-3\right)=45:5\)
\(70-\left(x-3\right)=9\)
\(x-3=70-9\)
\(x-3=61\)
\(x=61+3\)
\(x=64\)
\(b.10+2.x=4^5:4^3\)
\(10+2.x=4^2=16\)
\(2.x=16-10\)
\(2.x=6\)
\(x=6:2\)
\(x=3\)
Học tốt !
a)\(70-5.\left(x-3\right)=45\)
\(5.\left(x-3\right)=70-45\)
\(5.\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
b) \(10+2.x=4^5:4^3\)
\(10+2.x=4^2\)
\(10+2.x=16\)
\(2x=16-10\)
\(2x=6\)
\(x=6:2\)
\(x=3\)
a)70-5(x-3)=45
<=>5(x-3)=70-45
<=>5(x-3)=35
<=>x-3=35:5
<=>x-3=7
<=>x=7+3
<=>x=10
b)10+2x=45:43
<=>10+2x=42
<=>10+2x=16
<=>2x=16-10
<=>2x=6
<=>x=6:2
<=>x=3
a) 70- 5.(x-3)=45
=>5.(x-3)=70-45
=>5.(x-3)=25
=>x-3=25:5
=>x-3=5
=>x=5+3
=>x=8
a) 70 - 5 (x - 3) = 45
5 (x - 3) =70-45
5 (x - 3) =25
(x - 3)=25:5
(x - 3)=5
x=5+3
x=8
b) 10 + 2.x = 4^5 : 4^3
10 + 2.x=4^2
10 + 2.x=16
2.x=16-10
2.x=6
x=6:2
x=3
c) 2x - 138 = 2^3 . 3^2
2x - 138 = 8.9
2x - 138 = 72
2x=72+138
2x=210
x=210:2
x=105
d) 231 - (x - 6) = 133 : 13
(đề sai)
a,70 – 5.(x – 3) = 45
5.(x -3) = 70 - 45
5.(x – 3) = 25
x – 3 = 25 : 5
x – 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
b,\(2x-138=8x9=72\)
\(2x=138+72=210\)
\(x=210:2=105\)
c,\(10+2x=4^2\)\(=16\)
\(2x=16-10=6\)
\(x=6:2=3\)
d, 231 – (x- 6) = 1339 : 13
231 – (x – 6) = 103
x – 6 = 231 – 103
x – 6 = 128
x = 128 + 6
x = 134
Vậy x = 134
a) 8 + 2x = 20
2x = 20 - 8
2x = 12
x = 12 : 2
x = 6
Vậy x = 6
b) 70 - 5(x - 3) = 45
5(x-3) = 70 - 45
5(x-3) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
c) (3x - 2^4). 7^3 = 2. 7^4
(3x - 16) . 147 = 2 . 1029
(3x - 16) . 147 = 2058
3x - 16 = 2058 : 147
3x - 16 = 14
3x = 14 + 16
3x = 30
x = 30 : 3
x = 10
Vậy x = 10
a/ 8+2.x=20
2x=20-8
2x=12
x=12:2=4
b/70-5.(x-3)=45
5.(x-3)=70-45=25
x-3=25:5=5
x=5+3=8
c/(3.x-24).73=2.74
(3.x-24).73=4802
3x-24 =4802:73=14
3x=14+24=30
x=30:3=10
tk nhen
a, \(70-5.\left(x-3\right)=45\\ =>5.\left(x-3\right)=70-45=25\\ =>x-3=25:5=5\\ =>x=5+3=8\)
b, \(10+2.x=4^5:4^3\\ =>2.x=\left(4^5:4^3\right)-10=16-10=6\\ =>x=6:2=3\)
a, 70 - 5 . ( \(x\) - 3) = 45
5 . ( \(x\)-3) = 70 - 45
5 . ( \(x\) - 3) = 25
\(x\) - 3 = 25: 5
\(x\) - 3 = 5
\(x\) = 5 + 3
\(x\) = 8
Vậy \(x\) = 8
b, 10 + 2 .\(x\) = \(4^5:4^3\)
10 + 2 . \(x\) = 1024 : 64
10 + 2 .\(x\) = 16
2 .\(x\) = 16 - 10
2 . \(x\) = 6
\(x\) = 6 : 2
\(x\) = 3
Vậy \(x\) = 3
Chúc bạn học tốt !!!