Tìm số tự nhiên x biết
a; 70-5.(x-3)=45 b,10+2.x=45:43
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\(3^{99}=\left(3^3\right)^{33}=27^{33}>27^{21}>11^{21}\\ 16^x< 128^4\\ \Rightarrow\left(2^4\right)^x< \left(2^7\right)^4\\ \Rightarrow2^{4x}< 2^{28}\Rightarrow4x< 28\Rightarrow x< 7\)
a) 2436 : x = 12
\(\Rightarrow\) x = 2436 : 12
\(\Rightarrow\) x = 203
b) 6x - 5 = 613
\(\Rightarrow\) 6x = 618
\(\Rightarrow\) x = 103
c) 12(x - 1) = 0
\(\Rightarrow\) x - 1 = 0
\(\Rightarrow\) x = 1
d) 0 : x = 0 (đúng \(\forall\)x \(\in\) N)
\(\Rightarrow\) x \(\in\) N
a) Ta có: 2436:x=12
nên x=2436:12
hay x=203
b) Ta có: 6x-5=613
nên 6x=618
hay x=103
c) Ta có: 12(x-1)=0
mà 12>0
nên x-1=0
hay x=1
d) Ta có: 0:x=0
nên \(x\in R;x\ne0\)
a: =>12x-64=32
=>12x=96
=>x=8
b: =>x-1=5
=>x=6
c: =>2^x*3=96
=>2^x=32
=>x=5
\(1,\\ 16^x< 128^4\Rightarrow\left(2^4\right)^x< \left(2^6\right)^4\Rightarrow2^{4x}< 2^{24}\\ \Rightarrow4x=24\Rightarrow x=6\\ 2,\\ 3^{99}=\left(3^3\right)^{33}=27^{33}>27^{21}>11^{21}\)
\(a,2x+34=56\\ \Rightarrow2x=56-34\\ \Rightarrow x=22:2\\ \Rightarrow x=11\\ b,87-\left(x-654\right):3=21\\ \Rightarrow\left(x-654\right):3=87-21\\ \Rightarrow x-654=66:3\\ \Rightarrow x=22+654\\ \Rightarrow x=676\\ c,7^{65}:7^x=7^{43}.7^{21}\\ \Rightarrow7^{65-x}=7^{43+21}\\ \Rightarrow65-x=64\\ \Rightarrow x=65-64\\ \Rightarrow x=1\)
a, ( 19x + 2.52 ) : 14 = ( 13 - 8 )2 - 42
( 19x + 2.52 ) : 14 = ( 13 - 8 )2 - 16
( 19x + 2.52 ) : 14 = 52 - 16
( 19x + 2.52 ) : 14 = 25 - 16
( 19x + 2.52 ) : 14 = 9
( 19x + 2.25 ) : 14 = 9
( 19x + 2.25 ) = 9 . 14
( 19x + 2.25 ) = 126
( 19x + 50 ) = 126
19x = 126 - 50
19x = 76
x = 76 : 19
x = 4
Vậy x = 4
b, 2 . 3x = 10 . 312 + 8 . 274
2 . 3x = 10 . 274 + 8 . 274
2 . 3x = 274 . ( 10+8 )
2 . 3x = 274 . 18
2 . 3x = 9565938
3x = 9565938 : 2
3x = 4782969
3x = 314
=> x = 14
Vậy x = 14
Đây nha bạn!!!
Chúc bạn học tốt!!!
a, ( 19x + 2.52 ) : 14 = ( 13 - 8 )2 - 42
( 19x + 2.52 ) : 14 = ( 13 - 8 )2 - 16
( 19x + 2.52 ) : 14 = 52 - 16
( 19x + 2.52 ) : 14 = 25 - 16
( 19x + 2.52 ) : 14 = 9
( 19x + 2.25 ) : 14 = 9
( 19x + 2.25 ) = 9 . 14
( 19x + 2.25 ) = 126
( 19x + 50 ) = 126
19x = 126 - 50
19x = 76
x = 76 : 19
x = 4
Vậy x = 4
b, 2 . 3x = 10 . 312 + 8 . 274
2 . 3x = 10 . 274 + 8 . 274
2 . 3x = 274 . ( 10+8 )
2 . 3x = 274 . 18
2 . 3x = 9565938
3x = 9565938 : 2
3x = 4782969
3x = 314
=> x = 14
Vậy x = 14
\(a,\Rightarrow x=30-18=12\\ b,\Rightarrow x+6=45:5=9\\ \Rightarrow x=9-6=3\\ c,\Rightarrow38-3x=4^2=16\\ \Rightarrow3x=38-16=22\\ \Rightarrow x=\dfrac{22}{3}\)
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 !