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3x+1+2.3x-1=99

=>3x-1(32+2)=99

=>3x-1.11=99

=>3x-1=99:11=9=32

=.x-1=2

=>x=3

Vậy x=3

b,3.2x+2+3.2x=120

=>3.2x(22+1)=120

=>3.2x.5=120

=>3.2x=120:5

=>2x=24:3=8=23

=>x=3

Vậy x=3

=

13 tháng 7 2023

\(\Rightarrow\left(x+x+x+x\right)+\left(3,2+1,8+1,7+2,3\right)=25,2\)

\(\Rightarrow4x+9=25,2\)

\(\Rightarrow4x=16,2\Rightarrow x=4,05\)

24 tháng 3 2018

a)197-9(x+3)=80

=>9(x+3)=197-80

=>9(x+3)=117

=>x+3=117:9

=>x+3=13

=>x=13-3=10

b)7(x-14)+35=56

=>7(x+14)=56-35

=>7(x+14)=21

=>x+14=21/7

=>x+14=3

=>x=3-14=(-11)

c)2.3x-1=54

=>3x-1=54:2

=>3x-1=27

=>3x-1=33

=>x-1=3

=>x=3+1=4

d)3.2x-1=24

=>2x-1=24:3

=>2x-1=8

=>2x-1=23

=>x-1=3

=>x=3+1=4


 

24 tháng 3 2018

\(a,197-9\left(x+3\right)=80\)

\(197-\left(9x+27\right)=80\)

\(197-9x-27=80\)

\(197-9x=107\)

\(9x=90\)

\(x=10\)

\(b,7\left(x-141\right)+35=56\)

\(7x-987+35=56\)

\(7x=56-35+987\)

\(7x=1008\)

\(x=144\)

`#3107`

b)

`2.3^x = 162`

`\Rightarrow 3^x = 162 \div 2`

`\Rightarrow 3^x = 81`

`\Rightarrow 3^x = 3^4`

`\Rightarrow x = 4`

Vậy, `x = 4`

c)

`(2x - 15)^5 = (2 - 15)^3`

\(\Rightarrow \)`(2x - 15)^5 - (2x - 15)^3 = 0`

\(\Rightarrow \)`(2x - 15)^3 . [ (2x - 15)^2 - 1] = 0`

\(\Rightarrow\left[{}\begin{matrix}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}2x-15=0\\\left(2x-15\right)^2=1\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}2x=15\\\left(2x-15\right)^2=\left(\pm1\right)^2\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=\dfrac{15}{2}\\2x-15=1\\2x-15=-1\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=\dfrac{15}{2}\\2x=16\\2x=-14\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=\dfrac{15}{2}\\x=8\\x=-7\end{matrix}\right.\)

Vậy, `x \in`\(\left\{-7;8;\dfrac{15}{2}\right\}.\)

`d)`

\(3^{x+2}-5.3^x=?\) Bạn ghi tiếp đề nhé!

`e)`

\(7\cdot4^{x-1}+4^{x-1}=23?\)

\(4^{x-1}\cdot\left(7+1\right)=23\\ \Rightarrow4^{x-1}\cdot8=23\\ \Rightarrow4^{x-1}=\dfrac{23}{8}\)

Bạn xem lại đề!

`f)`

\(2\cdot2^{2x}+4^3\cdot4^x=1056\)

\(\Rightarrow2\cdot2^{2x}+\left(2^2\right)^3\cdot\left(2^2\right)^x=1056\\ \Rightarrow2\cdot2^{2x}+2^6\cdot2^{2x}=1056\\ \Rightarrow2^{2x}\cdot\left(2+2^6\right)=1056\\ \Rightarrow2^{2x}\cdot66=1056\\ \Rightarrow2^{2x}=1056\div66\\ \Rightarrow2^{2x}=16\\ \Rightarrow2^{2x}=2^4\\ \Rightarrow2x=4\\ \Rightarrow x=2\)

Vậy, `x = 2`

_____

\(10 -{[(x \div 3+17) \div 10+3.2^4] \div 10}=5\)

\(\Rightarrow\left[\left(x\div3+17\right)\div10+48\right]\div10=10-5\)

\(\Rightarrow\left[\left(x\div3+17\right)\div10+48\right]\div10=5\)

\(\Rightarrow\left(x\div3+17\right)\div10+48=50\)

\(\Rightarrow\left(x\div3+17\right)\div10=2\)

\(\Rightarrow x\div3+17=20\)

\(\Rightarrow x\div3=3\\ \Rightarrow x=9\)

Vậy, `x = 9.`

1 tháng 1

a, 7\(x\) - \(x\) = 521 : 519 + 3.22.7

     6\(x\)    = 53 + 3.4.7

    6\(x\)    = 125 + 12.7

    6\(x\)  = 125 + 84

    6\(x\) = 209

     \(x\)  = 209 : 6

    \(x\) = \(\dfrac{209}{6}\)

b; 11\(x\) - 7\(x\) + 34 : 33 = 54 + 2\(x\)

    4\(x\) + 3 = 625 + 2\(x\)

   4\(x\) - 2\(x\) = 625 - 3

   2\(x\)        = 622

     \(x\)        = 622 : 2

    \(x\)        = 311

c; 75 - 5.(\(x-3\))3 = 700

          5.(\(x\) - 3)3 = 700 - 75

         5.(\(x\) - 3)3 = - 625

           (\(x\) - 30)3 = - 625 : 5

           (\(x\) - 30)3 = - 125

           (\(x-3\))3 =  (-5)3

           \(x\) - 3 = - 5 

           \(x\)         = - 5 + 3

            \(x\)       = -2

 

    

1 tháng 1

d, 3.(2\(x\) - 1)2 = 75

       (2\(x\) - 1)2 = 75 : 3

       (2\(x\) - 1)2 = 25

       \(\left[{}\begin{matrix}2x-1=-5\\2x-1=5\end{matrix}\right.\)

       \(\left[{}\begin{matrix}2x=-5+1\\2x=5+1\end{matrix}\right.\)

       \(\left[{}\begin{matrix}2x=-4\\2x=6\end{matrix}\right.\)

       \(\left[{}\begin{matrix}x=-2\\x=3\end{matrix}\right.\)

27 tháng 1 2020

1) \(-\frac{2}{3}\left(x-\frac{1}{4}\right)=\frac{1}{3}\left(2x-1\right)\)

\(-\frac{2}{3}x+\frac{1}{6}=\frac{2}{3}x-\frac{1}{3}\)

\(-\frac{2}{3}x-\frac{2}{3}x=-\frac{1}{3}-\frac{1}{6}\)

\(-\frac{4}{3}x=-\frac{1}{2}\)

\(x=\left(-\frac{1}{2}\right):\left(-\frac{4}{3}\right)\)

\(x=\frac{3}{8}\)

6 tháng 10 2021

2.9-x-3.4=8.3

18-x-12=24

6-x=24

x=6-24

x=-18

Vậy x=-18

Học tốt nha -Kết bạn facebook nguyenminh không dấu và ko avatar

6 tháng 10 2021

2 . 32 - x - 3 . 22 = 23 . 3

2 . 9 - x - 3 . 4 = 8 . 3

18 - x - 12 = 24

18 - x = 24 + 12

18 - x = 36

x = 18 - 36

x = - 18

5 tháng 11 2019

\(2^3.2^2+5^5:5^3\)

\(=2^5+5^2\)

\(=32+25\)

\(=57\)

Bài 1 a\(17.25\)

\(=\left(1+16\right).25\)

\(=1.25+16.25\)

\(=25+4.4.25\)

\(=25+4.100\)

\(=25+400\)

\(=425\)

b, Bạn kia làm rồi nhé!

c, \(29.31+66.69+31.37\)

\(=31.\left(29+37\right)+66.99\)

\(=31.66+66.69\)

\(=66\left(31+69\right)\)

\(=66.100\)

\(6600\)

13 tháng 7 2023

\(10+2\cdot x=4^5:4^3\)

\(\Rightarrow10+2\cdot x=4^{5-3}\)

\(\Rightarrow10+2\cdot x=4^2\)

\(\Rightarrow10+2\cdot x=16\)

\(\Rightarrow2\cdot x=16-10\)

\(\Rightarrow2\cdot x=6\)

\(\Rightarrow x=\dfrac{6}{2}=3\)

__________________

\(2\cdot x-6^2:18=3\cdot2^2\)

\(\Rightarrow2\cdot x-36:18=12\)

\(\Rightarrow2\cdot x-2=12\)

\(\Rightarrow2\cdot x=12+2\)

\(\Rightarrow2\cdot x=14\)

\(\Rightarrow x=\dfrac{14}{2}=7\)

_________________

\(70-5\cdot\left(x-3\right)=3\cdot2\)

\(\Rightarrow70-5\cdot\left(x-3\right)=6\)

\(\Rightarrow70-5x+15=6\)

\(\Rightarrow-5x+15=6-70\)

\(\Rightarrow-5x+15=64\)

\(\Rightarrow-5x=64-15\)

\(\Rightarrow-5x=49\)

\(\Rightarrow x=-\dfrac{49}{5}\)