5(x-1)=125-25

5(x-1)=100

x-1=100:5

x-1=20

x=20+1

x=21

12(x-1):3=64+8

12(x-1):3=72

12(x-1)=72.3

12(x-1)=216

x-1=216:12

x-1=18

x=18+1

x=19

(x-1)^3=5^3

=>x-1=5

x=5+1

x=6

5(x-2)-125=15

=>\(5\left(x-2\right)=15+125=140\)

=>x-2=28

=>x=28+2=30

Câu trả lời:

5. (𝑥 − 2) − 125 = 15 

5.  ( x - 2)          = 125 - 15

5.  ( x - 2)          = 110

      x - 2            = 110 : 5

       x - 2           =  22

       x                 =  22 - 2

       x                 =  20

\(a,\Leftrightarrow x^3=\dfrac{20}{3}\Leftrightarrow x=\sqrt[3]{\dfrac{20}{3}}\\ b,\Leftrightarrow x-1=9\Leftrightarrow x=10\\ c,\Leftrightarrow\left[{}\begin{matrix}x-1=5\\x-1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6\\x=-4\end{matrix}\right.\\ d,\Leftrightarrow2x+1=5\Leftrightarrow x=2\\ e,\Leftrightarrow2x-4=4\Leftrightarrow x=4\)

Câu a) xem lại đề giùm nhé em

b) \(\left(x-1\right)^3=9^3\)

\(x-1=9\)

\(x=10\)

Vậy \(x=10\)

c) \(\left(x-1\right)^2=25\)

\(x-1=5\) hoặc \(x-1=-5\)

* \(x-1=5\)

\(x=6\)

* \(x-1=-5\)

\(x=-4\)

Vậy \(x=-4\); \(x=6\)

d) \(\left(2x+1\right)^3=125\)

\(\left(2x+1\right)^3=5^3\)

\(2x+1=5\)

\(2x=4\)

\(x=2\)

Vậy \(x=2\)

e) Sửa đề: \(\left(2x+4\right)^3=64\)

\(\left(2x+4\right)^3=4^3\)

\(2x+4=4\)

\(2x=0\)

\(x=0\)

Vậy \(x=0\)

Số đó là:

125 : 25 x 100= 500

 Đ/S:....

tk mk nhá

Số đó là :

125 : 25% = 500

Đáp số : 500

Chúc bạn học tốt !

Số đó là: 125* 25%=125* 25/100=3125/100=125/4.

Đáp số: 125/4

Nhớ k nha!!

Bài 1 d)

\(1-2+3-4+5-6+...+2013\)

\(=1+\left(-2+3\right)+\left(-4+5\right)+...+\left(-2012+2013\right)\)

\(=1+1+1+...+1\left(1006s\right)\)

\(=1006.1=1006\)

b)\(\left(x-8\right)\left(x-2\right)=0\Leftrightarrow\orbr{\begin{cases}x-8=0\\x-2=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=8\\x=2\end{cases}}\)

c) \(\left(x+1\right)+\left(x+2\right)+...+\left(x+10\right)=9x+200\)

\(\Leftrightarrow\left(x+x+...+x\right)+\left(1+2+...+10\right)=9x+200\) (10 số hạng x)

\(\Leftrightarrow10x+55=9x+200\Leftrightarrow x+55=200\)

\(\Leftrightarrow x=145\)

các bạn ơi giúp mik ý đầu tiên đi

các bạn ơi giúp mik với mik đang cần gấp ai làm nhanh mik sẽ k giải chi tiết giúp mik nhé cảm ơn

(125^3 .7^5 -17^5 ) : 2001^2

(x-8) .(x-2) =0

(x+1) +(x+2)+...........+(x+10)=9.x+200 

\(\left(2x-1\right)^3=\dfrac{8}{125}\)

\(\left(2x-1\right)^3=\pm\left(\dfrac{2}{5}\right)^3\)

\(\text{Vậy }2x-1=\dfrac{2}{5}\)

       \(2x\)        \(=\dfrac{2}{5}+1=\dfrac{7}{5}\)

        \(x\)         \(=\dfrac{7}{5}.\dfrac{1}{2}=\dfrac{7}{10}\)

\(\text{hoặc }2x-1=\dfrac{-2}{5}\)

        \(2x\)        \(=\left(\dfrac{-2}{5}\right)+1=\dfrac{3}{5}\)

         \(x\)         \(=\dfrac{3}{5}.\dfrac{1}{2}=\dfrac{3}{10}\)

\(\Rightarrow x\in\left\{\dfrac{7}{10};\dfrac{3}{10}\right\}\)

\(a)3\left(x-1\right)^2=75\)

\(\Leftrightarrow\left(x-1\right)^2=25\)

\(\Leftrightarrow\orbr{\begin{cases}\left(x-1\right)^2=\left(-5\right)^2\\\left(x-1\right)^2=5^2\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x-1=-5\\x-1=5\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=-4\\x=6\end{cases}}\)

\(b)170+\left(84-5x\right):2^2=186\)

\(\Leftrightarrow\frac{84-5x}{4}=16\)

\(\Leftrightarrow84-5x=64\)

\(\Leftrightarrow5x=20\)

\(\Leftrightarrow x=4\)

\(c)125-5\left(x+4\right)=38\)

\(\Leftrightarrow5\left(x+4\right)=87\)

\(\Leftrightarrow x+4=\frac{87}{5}\)

\(\Leftrightarrow x=\frac{87}{5}-4\)

\(\Leftrightarrow x=\frac{67}{5}\)

124 số 

vì sao

\(1,2\sqrt{27}+5\sqrt{12}-3\sqrt{48}\\ =2.3\sqrt{3}+5.2\sqrt{3}-3.4\sqrt{3}\\ =6\sqrt{3}+10\sqrt{3}-12\sqrt{3}\\ =4\sqrt{3}\)

\(2,\sqrt{147}+\sqrt{75}-4\sqrt{27}\\ =7\sqrt{3}+5\sqrt{3}-4.3\sqrt{3}\\ =7\sqrt{3}+5\sqrt{3}-12\sqrt{3}\\ =\sqrt{3}\left(7+5-12\right)\\ =0\)

\(3,3\sqrt{2}\left(4-\sqrt{2}\right)+3\left(1-2\sqrt{2}\right)^2\\ =3\sqrt{2}.\left(4-\sqrt{2}\right)+3\left(1-4\sqrt{2}+8\right)\\ =12\sqrt{2}-6+3-12\sqrt{2}+24\\ =21\)

\(4,2\sqrt{5}-\sqrt{125}-\sqrt{80}+\sqrt{605}\\ =2\sqrt{5}-5\sqrt{5}-4\sqrt{5}+11\sqrt{5}\\ =\sqrt{5}\left(2-5-4+11\right)\\ =4\sqrt{5}\)

1: =6căn 3+10căn 3-12căn 3=4căn 3

2: =7căn 3+5căn 3-12căn 3=0

3: =12căn 2-6+3(9-4căn 2)

=12căn 2-6+27-12căn 2=21

4: =2căn 5-5căn 5+4căn 5+9 căn 5

=10căn 5