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a) 7(x-5)+14=56
<=>7(x-5)=42
<=>x-5=6
<=>x=11
b)9(x+1)-3=15
<=>9(x+1)=18
<=>x+1=2
<=>x=1
c)12(x+5)-36=48
<=>12(x+5)=84
<=>x+5=7
<=>x=2
d)5(x+14)=145
<=>x+14=29
<=>x=15
1 / 5 x 2 2 + ( x + 3 ) = 5 2
20 + ( x + 3 ) = 25
x + 3 = 5
x = 2
2 / 3 2 x 2 + ( x + 25 ) = 10 2
18 + ( x + 25 ) = 100
x + 25 = 82
x = 57
3 / 2 3 x 5 - ( x + 3 2 ) = 10
40 - ( x + 9 ) = 10
x + 9 = 30
x = 21
4 / 7 2 - 7 x ( 13 - x ) = 14
49 - 7 x ( 13 - x ) = 14
7 x ( 13 - x ) = 35
13 - x = 5
x = 8
5 / 14 x - 2 x 7 2 = 2 x 3 x 7
14 x - 98 = 42
14 x = 140
x = 10
1/ 5 x 22 + ( x + 3 ) = 52
2/ 32 x 2 + ( x + 25 ) = 102
3/ 23 x 5 - ( x + 32 ) = 10
4/ 72 - 7 x ( 13 - x ) = 14
5/ 14x - 2 x 72 = 2 x 3 x 7
1 / 5 x 2 2 + ( x + 3 ) = 5 2
20 + ( x + 3 ) = 25
x + 3 = 5
x = 2
2 / 3 2 x 2 + ( x + 25 ) = 10 2
18 + ( x + 25 ) = 100
x + 25 = 82
x = 57
3 / 2 3 x 5 - ( x + 3 2 ) = 10
40 - ( x + 9 ) = 10
x + 9 = 30
x = 21
4 / 7 2 - 7 x ( 13 - x ) = 14
49 - 7 x ( 13 - x ) = 14
7 x ( 13 - x ) = 35
13 - x = 5
x = 8
5 / 14 x - 2 x 7 2 = 2 x 3 x 7
14 x - 98 = 42
14 x = 140
x = 10
nhé !
92.(x + 1) - 3 = 23 + (72.2) : 14
81.(x + 1) - 3 = 8 + 98 : 14
81.(x + 1) - 3 = 8 + 7
81.(x + 1) - 3 = 15
81.(x + 1) = 15 + 3
81.(x + 1) = 18
x + 1 = 18 : 81
x + 1 = 2/9
x = 2/9 - 1
x = -7/9
\(9x+2.3^2=3^4\)
\(3^2x+2.3^2=3^4\)
\(3^2\left(x+2\right)=3^4\)
\(x+2=3^4-3^2\)
\(x+2=3^2\)
\(x+2=9\)
\(x=7\)
\(7^2-\left(15-x\right)=5.2^2\)
\(49-15-x=5.4\)
\(34-x=20\)
\(x=14\)
\(\left(x+3\right)^3=27\)
=>\(x+3=3\)
\(x=0\)
\(\left(x-2\right)^2=9\)
=>\(x-2=3\)hoặc \(x-2=-3\)
Với x-2=3 =>x=5
Với x-2=-3 =>x=-1
Vậy x=5;x=-1
\(\left(x-4\right)^2=1\)
=>x-4=1 hoặc x-4=-1
Với x -4=1 =>x=5
Với x-4=-1 =>x=3
Vậy x=5;x=3
\(\left(2x-4\right)^3=0\)
=>2x-4=0=>2x=4=>x=2
\(7^2-7\left(13-x\right)=14\)
-49-91-7x=14
-140-7x=14
7x=-140-14
7x=-154
x=-22
\(\frac{11\times3^{22}\times3^7\times9^{15}}{\left(2\times3^{14}\right)^2}=\frac{11\times3^{29}\times\left(3^2\right)^{15}}{2^2\times3^{28}}\)\(=\frac{11\times3^{29}\times3^{30}}{4\times3^{28}}=\frac{11\times3^{59}}{4\times3^{28}}\)\(=\frac{11\times3^{31}}{4}\)
- Kết quả to quá nên bạn tưn tính nhé !
15 : ( x + 2 ) = ( 33 + 3 ) : 10
15 : ( x + 2 ) = ( 27 + 3 ) : 10
15 : ( x + 2 ) = 30 : 10
15 : ( x + 2 ) = 3
x + 2 = 15 : 3
x + 2 = 5
x = 5 - 2
x = 3
Vậy x = 3
32( x + 1 ) - 3 = 23 + 72 . 2 : 14
9( x + 1 ) - 3 = 8 + 49 . 2 : 14
9( x + 1 ) - 3 = 8 + 98 : 14
9( x + 1 ) - 3 = 8 + 7
9( x + 1 ) - 3 = 15
9( x + 1 ) = 15 + 3
9( x + 1 ) = 18
x + 1 = 18 : 9
x + 1 = 2
x = 2 - 1
x = 1
Vậy x = 1
Học Tốt!!!
a, 15 : (x+2) = (33 +3) :10
15 : (x+2) = (27+3): 10
15 : ( x+2) = 30: 2
15 : (x + 2) = 15
x+2 = 15: 15
x+2 = 1
x = 1-2
x = -1
b, 32 (x+1) - 3 = 23 + 72 . 2 :14
9 ( x+1) -3 = 8 + 49 . 2 : 14
9 (x+1) -3 = 8+98:14
9 (x+1) -3 = 8+7
9 (x+1) -3 = 15
9 (x+1) =15+3
9(x+1) = 18
x+1 = 18 :2
x+1 = 9
x = 9-1
x =8
Ta có: \(4.\left(5-x\right)-3.\left(1-x\right)=-3^2\)
\(\Leftrightarrow20-4x-3+3x=9\)
\(\Leftrightarrow-4x+3x=9-20+3\)
\(\Leftrightarrow-x=-8\)
\(\Leftrightarrow x=8\)
Vậy: \(x=8\)
Ta có: \(3.\left|2x-3\right|=7-\left(-14\right)\)
\(\Leftrightarrow3.\left|2x-3\right|=7+14=21\)
\(\Leftrightarrow\left|2x-3\right|=\dfrac{21}{3}=7\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-3=7\\2x-3=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=10\\2x=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-2\end{matrix}\right.\)
Vậy: \(x=-2;5\)
Ta có: \(2^{2x-1}-3^2=23\)
\(\Leftrightarrow2^{2x-1}-9=23\)
\(\Leftrightarrow2^{2x-1}=32\)
\(\Leftrightarrow2^{2x-1}=2^5\)
\(\Leftrightarrow2x-1=5\)
\(\Leftrightarrow2x=6\)
\(\Leftrightarrow x=3\)
Vậy: \(x=3\)
_Chúc bạn học tốt_
[(x-3)2 + 7] .2 = 14
(x-3)2 + 7 = 14 : 2
(x-3)2 + 7 = 7
(x-3)2 = 7-7
(x-3)2 = 0
(x-3)2 = 02
x-3 = 0
x=0+3
x= 3