(x - 3)⁴ =16

=> 2⁴ = 16

=> x- 3 = 2

=> x = 5

4^(x-3) =16

=> 4² = 16

=> x-3 = 2 

=> x = 5

(x - 3)⁴ = 16

(x - 3)⁴ = 2⁴ = (-2)⁴

=> \(\orbr{\begin{cases}x-3=2\\x-3=-2\end{cases}}\)=> \(\orbr{\begin{cases}x=5\\x=1\end{cases}}\)

4^x-3 = 16

4^x-3 = 4²

=> x - 3 = 2

=> x = 2 + 3

=> x = 5

2(x-1)-3(2x+2)-4(2x+3)=16

2x-2-6x+6-8x+12=16

(2x-6x-8x)-(2+6+12)=16

(-12).x-20=16

(-12).x=16+20=36

x=36:(-12)=-3

2(x-1)-3(2x+2)-4(2x+3)=16

2x-2-6x-6-8x-12=16

2x-6x-8x=16+2+6+12

-12x=36

x=-3

Bạn ấy trả lời đúng rồi

Mike bạn ấy nhé

Chúc học tốt

a/\(450:\left(x-19\right)=50\)

=>\(x-19=9\)

=>\(x=28\)

Vậy...

b/\(3^2.\left(x+4\right)-5^2=5x.2^2\)

\(9\left(x+4\right)=20x+25\)

\(20x+25=9x-36\)

\(11x=-61\)

\(x=-\dfrac{61}{11}\)

Vậy..

c/Tương tự

d/Tương tự

a) \(\Leftrightarrow\left|2x-3\right|=\frac{1}{4}\Leftrightarrow\orbr{\begin{cases}x\ge\frac{3}{2}\mid:2x-3=\frac{1}{4}\Rightarrow2x=\frac{13}{4}\Rightarrow x=\frac{13}{8}\left(TM\right)\\x< \frac{3}{2}\mid:3-2x=\frac{1}{4}\Rightarrow2x=\frac{11}{4}\Rightarrow x=\frac{11}{8}\left(TM\right)\end{cases}.}\)

b) \(\Leftrightarrow\left|x-1\right|=\frac{3}{4}\Leftrightarrow\orbr{\begin{cases}x\ge1\mid:x-1=\frac{3}{4}\Rightarrow x=\frac{7}{4}\left(TM\right)\\x< 1\mid:1-x=\frac{3}{4}=>x=\frac{1}{4}\left(TM\right)\end{cases}}\)

c) \(\frac{3}{5\left(x-\frac{5}{6}\right)}-\frac{1}{2\left(\frac{3}{2}-1\right)}=-\frac{1}{4}\Leftrightarrow\frac{3}{\frac{5\left(6x-5\right)}{6}}-\frac{1}{2\cdot\frac{1}{2}}=-\frac{1}{4}\Leftrightarrow\frac{18}{5\left(6x-5\right)}=-\frac{1}{4}+1\)

\(\Leftrightarrow\frac{18}{5\left(6x-5\right)}=\frac{3}{4}\Leftrightarrow6x-5=\frac{24}{5}\Leftrightarrow6x=\frac{49}{5}\Leftrightarrow x=\frac{49}{30}\)

d) \(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x\left(x+1\right)}=\frac{2015}{2016}\)

\(\Leftrightarrow\frac{2}{2\cdot3}+\frac{2}{3\cdot4}+\frac{2}{4\cdot5}+...+\frac{2}{x\left(x+1\right)}=\frac{2015}{2016}\)

\(\Leftrightarrow2\cdot\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{x}-\frac{1}{x+1}\right)=\frac{2015}{2016}\)

\(\Leftrightarrow2\left(\frac{1}{2}-\frac{1}{x+1}\right)=\frac{2015}{2016}\Leftrightarrow2\cdot\frac{x+1-2}{2\left(x+1\right)}=\frac{2015}{2016}\Leftrightarrow\frac{x-1}{x+1}=\frac{2015}{2016}\)

\(\Leftrightarrow2016x-2016=2015x+2015\Leftrightarrow x=2015+2016=4031\)

Vậy x = 4031.

A = 1 - 2 + 3 - 4 + 5 - 6 + ...... + 19 - 20

   = (1 - 2) + (3 - 4) +( 5 - 6) + ...... + (19 - 20)

   = -1 + (-1) + (-1) + ...... + (-1)

   = -1 x 10

   = -10

A=1-2+3-4+5-6+.....+19-20

A=(1-2)+(3-4)+(5-6)+....+(19-20)

A=(-1)+(-1)+(-1)+...+(-1)  co 10 so -1

=>A= (-1)×10=-10

Ma -10 chia het cho 2 va 5 nhung khong chia het cho 3

2(x-1)-3(2x+2)-4(2x+3)=16

\(\Rightarrow\)2x-2-6x-6-8x-12=16

\(\Rightarrow\)(2x-6x-8x)-(2+6+12)=16

\(\Rightarrow\)-12x-20=16

\(\Rightarrow\)-12x=16+20

\(\Rightarrow\)-12x=36

\(\Rightarrow\)x = 36 :(-12)

\(\Rightarrow\)x= -3 . tick nha

hay la rut gon

nhan tung ve ra roi triet tieu 

làm bừa thui,ai tích mình mình tích lại

Số số hạng là : 

Có số cặp là :

50 : 2 = 25 ( cặp )

Mỗi cặp có giá trị là :

99 - 97 = 2 

Tổng dãy trên là :

25 x 2 = 50

Đáp số : 50

=50

..............học tốt...............