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a)5. x +73.21=73.26
5. x +1533=1898
5.x =1898-1533
5. x =365
x =365:5
x =73
b)128-3.(x+4)=23
3.(x+4)=128-23
3.(x+4)=105
x+4=105:3
x+4=35
x =35-4
x =31
c)(x+1)+(x+3)+(x+4)+.....+(x+100)=5750
suy ra (x+x+x+......+x)+(1+2+3+...+100)
suy ra 100.x + 5050=575 0
suy ra 100. x =5750-5050
suy ra 100. x =700
x =700:100
x =7
Bạn tham khảo bài mình nhé .
a) 5 . x + 73 . 21 = 73 . 26
5 . x + 1533 = 1898
5 . x = 1898 - 1533
5 . x = 365
x = 365 : 5
x = 73
Vậy x = 73
b) 128 - 3 ( x + 4 ) = 23
3 ( x + 4 ) = 128 - 23
3 ( x + 4 ) = 105
x + 4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31
Vậy x = 31
c) ( x + 1 ) + ( x + 3 ) + ( x + 3 ) + ... + ( x + 100 ) = 5750
\(\Rightarrow\) ( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 )
\(\Rightarrow\) 100 . x + 5050 = 5750
\(\Rightarrow\) 100 . x = 5750 - 5050
\(\Rightarrow\)100 . x = 700
x = 700 : 100
x = 7
Vậy x = 7 .
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2/3+5/8=16/24+15/24=31/24
4 và 2/5-2 và 2/3=22/5-7/3=66/15-35/15=31/15
x + 2 và 1/5 =4 và 2/3
x + 11/5 = 14/3
x = 14/3-11/5
x = 37/15
x : 3/2 = 4/15
x = 4/15*3/2
x = 2/5
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a)\(2^x.4=128\Leftrightarrow2^x=32\Leftrightarrow2^x=2^5\Rightarrow x=5\)
b)\(\left(2x+1\right)=125\Leftrightarrow2x=126\Leftrightarrow x=13\)
c)\(x^{15}=x\Leftrightarrow\orbr{\begin{cases}x=\pm1\\x=0\end{cases}}\)
d) \(\left(x-5\right)^4=\left(x-5\right)^5\Leftrightarrow\orbr{\begin{cases}x-5=1\\x-5=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=6\\x=5\end{cases}}\)
a,
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
b,
2x = 124
x = 62
c,
\(x^{15}-x=0\)
\(x\left(x^{14}-1\right)=0\)
\(\orbr{\begin{cases}x=0\\x^{14}-1=0\end{cases}}\)
\(\orbr{\begin{cases}x=0\\x^{14}=1\end{cases}}\)
\(\orbr{\begin{cases}x=0\\x=\pm1\end{cases}}\)
d,
\(0=\left(x-5\right)^5-\left(x-5\right)^4\)
\(\left(x-5\right)^4\left(x-5-1\right)=0\)
\(\orbr{\begin{cases}\left(x-5\right)^4=0\\x-6=0\end{cases}}\)
\(\orbr{\begin{cases}x=5\\x=6\end{cases}}\)
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a. 128 - 3 x (X + 2) = 23
3 x (X + 2) = 128 - 23
X + 2 = 105 : 3
X = 35 - 2
X = 33
b. (12 x X - 64) x 8 = 4,64
12 x X - 64 = 4,64 : 8
12 x X = 0,58 + 64
X = 64,58 : 12
X = \(\frac{3229}{600}\)
c. [(4 x X + 28) x 3 + 55] : 5 = 35
[(4 x X + 28) x 3 + 55] = 35 x 5
(4 x X + 28) x 3 = 175 - 55
4 x X + 28 = 120 : 3
4 x X = 40 - 28
X = 12 : 4
X = 3
d. 720 : [41 - (2 x X - 5)] = 8 x 5
41 - (2 x X - 5) = 720 : (8 x 5)
2 x X - 5 = 41 - 18
2 x X = 23 + 5
X = 28 : 2
X = 14
x nhỏ : dấu nhân
X lớn : X
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ông nội tui cũng ko bit nói chung là kết bạn vs tuui nha !
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\(x-2\frac{1}{4}=3\frac{1}{2}\)
\(x-\frac{9}{4}=\frac{7}{2}\)
\(x=\frac{7}{2}+\frac{9}{4}\)
\(x=\frac{14}{4}+\frac{9}{4}\)
\(x=\frac{23}{4}\)
\(5871:\left[928-\left(247-82.5\right)\right]\)
\(=5871:\left[928-\left(247-460\right)\right]\)
\(=5871:\left[928-\left(-213\right)\right]\)
\(=5871:1141\)