a) \(5x-65=5.3^2 \\ 5x-65=45\\5x=45+65\\5x=110\\x=22\)

b) \(200-(2x+6)=4^3\\2x+6=200-4^3\\2x+6=136\\2x=130\\x=65\)

c) \(2(x-51)=2.2^3+20\\2(x-51)=16+20\\2(x-51)=36\\x-51=18\\x=51+18=69\)

d) \(135-5(x+4)=35\\5(x+4)=135-45\\5(x-4)=90\\x-4=18\\x=18+4=22\)

e) \((2x-4)(15-3x)=0\\2(x-2).3(5-x)=0\\(x-2)(5-x)=0\\ \left[ \begin{array}{l}x-2=0\\5-x=0\end{array} \right. \\ \left[ \begin{array}{l}x=2\\x=5\end{array} \right.\)

f) \(2^{x+1} . 2^{2014}=2^{2016} \\ (2^{x+1} . 2^{2014}):2^{2014}=2^{2016} :2^{2014} \\ 2^{x=1}=2^{2016-2014} \\2^{x+1}=2^2\\x+1=2\\x=1\)

g) \(15+(x-1)^3=43\\(x-1)^3=15-42\\(x-1)^3=-27\\(x-1)^3=(-3)^3\\x-1=-3\\x=-2\)

h) \(15-x=17+(-9)\\15-x=17-9\\15-x=8\\x=15-8\\x=7\)

i) \(|x-5|=|-7|+|-4|\\|x-5|=7+4\\|x-5|=11\\ \left[ \begin{array}{l}x-5=11\\x-5=-11\end{array} \right. \\ \left[ \begin{array}{l}x=16\\x=-6\end{array} \right.\)

k) \(|x-3|-12=-9+|-7|\\|x-3|-12=-9+7\\|x-3|-12=-2\\|x-3|=10 \\ \left[ \begin{array}{l}x-3=10\\x-3=-10\end{array} \right. \\ \left[ \begin{array}{l}x=13\\x=-7\end{array} \right.\)

\(3^x.3-43=200\\ \Rightarrow3^{x+1}=243\\ \Rightarrow3^{x+1}=3^5\\ \Rightarrow x+1=5\\ \Rightarrow x=4.\)

a: =>3x-15-2x+6=51

=>x-9=51

=>x=60

b: =>432-2x+22+3x-15=200

=>x+439=200

=>x=-239

c: =>3x+17-4x+13=0

=>30-x=0

=>x=30

d: =>x-3-3x+6=-11-21=-32

=>-2x+3=-32

=>-2x=-35

=>x=35/2

\(3\cdot\left(x-5\right)-2\cdot\left(x-3\right)=51\)

\(\Rightarrow3x-15-2x+6=51\)

\(\Rightarrow x-9=51\)

\(\Rightarrow x=51+9\)

\(\Rightarrow x=60\)

b) \(432-2\cdot\left(x-11\right)+3\cdot\left(x-5\right)=200\)

\(\Rightarrow432-2x+22+3x-15=200\)

\(\Rightarrow x+439=200\)

\(\Rightarrow x=200-439\)

\(\Rightarrow x=-239\)

c) \(3x+17=4x-13\)

\(\Rightarrow4x-3x=17+13\)

\(\Rightarrow x=30\)

d) \(\left(x-3\right)+21=3\cdot\left(x-2\right)-11\)

\(\Rightarrow x-3+21=3x-6-11\)

\(\Rightarrow x+18=3x-17\)

\(\Rightarrow3x-x=18+17\)

\(\Rightarrow2x=35\)

\(\Rightarrow x=\dfrac{35}{2}\)

a, 2^x = 17 + 15

2^x = 32

2^x = 2⁵

=> x = 5

b, ( 7. x - 11 )³ = 2⁵ . 5² + 200

( 7 . x - 11 )³ = 32 . 25 + 200

( 7 . x - 11 )³ = 800 + 200

( 7 . x - 11 )³ = 1000

( 7 . x - 11 )³ = 10³

7 . x - 11 = 10

7 . x = 10 + 11

7 . x = 21

    x = 21 : 7

    x = 3

\(2^x\)-15=17

\(\Rightarrow\)\(2^x\)=17+15

\(\Rightarrow2^x\)=32

Vì \(2^6\)=32

\(\Rightarrow\)x=6

(7.x-11)^3=2^5.5^2+200

(7.x-11)^3=16.25+200

(7.x-11)^3=600

Xong bạn tìm số có có lập phương bằng 600 thế chắc là bạn tính dc rồi nhỉ!!!!!!!

có j kb vs mik ,mik hướng dẫn thêm cho

Lộn phép tính thôi cho cái đi hihi

Học sinh nhẩm và ghi kết quả như sau:

200 x 2 = 400

200 x 4 = 800

100 x 5 = 500

300 x 2 =600

400 x 2 =800

500 x 1 =500

200 x 2 = 400          300 x 2 =600

200 x 4 =  800         400 x 2 =800

100 x 5 = 500          500 x 1 =500

Ai đúng mình like !