-7/x=-21/(x-34)
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BC
2
5 tháng 1 2017
A, 34+(9-21)=3417-(x+3417)
34 + (-12) = 3417 - x - 3417
22 = ( 3417 - 3417 ) - x
22 = 0 - x
x = 0 - 22
x = -22
Vậy: x = - 22
B, (15-x)+(x-21)=7-(-8+x)
15 - x + x - 21 = 7 + 8 - x
-x + x = 7 + 8 - x - 15 + 21
0 = 15 - x - 15 + 21
0 = ( 15 - 15 ) - x + 21
0 = 0 - x + 21
-x = 0 - 0 - 21
- x = -21
x = 21
Vậy : x = 21
LT
1
3 tháng 3 2022
a: \(=\dfrac{18}{51}\cdot\dfrac{34}{9}\cdot\dfrac{17}{18}=\dfrac{17}{51}\cdot\dfrac{34}{9}=\dfrac{1}{3}\cdot\dfrac{34}{9}=\dfrac{34}{27}\)
b: \(=\dfrac{21}{32}\cdot\dfrac{4}{7}\cdot25\cdot\dfrac{4}{5}=\dfrac{21}{7}\cdot\dfrac{4}{32}\cdot20=60\cdot\dfrac{1}{8}=\dfrac{15}{2}\)
30 tháng 6 2017
\(\frac{7}{\left(x+3\right)\left(x+10\right)}+\frac{11}{\left(x+10\right)+\left(x+21\right)}+\frac{13}{\left(x+21\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\frac{1}{x+3}-\frac{1}{x+10}+\frac{1}{x+10}-\frac{1}{x+21}+\frac{1}{x+21}-\frac{1}{x+34}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\frac{1}{x+3}-\frac{1}{x+34}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\frac{\left(x+34\right)-\left(x+3\right)}{\left(x+3\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\frac{31}{\left(x+3\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Rightarrow x=31\)
KN
16 tháng 8 2020
\(\frac{7}{\left(x+3\right)\left(x+10\right)}+\frac{11}{\left(x+10\right)\left(x+21\right)}+\frac{13}{\left(x+21\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow\frac{1}{x+3}-\frac{1}{x+10}+\frac{1}{x+10}-\frac{1}{x+21}+\frac{1}{x+21}-\frac{1}{x+34}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow\frac{1}{x+3}-\frac{1}{x+34}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow\frac{\left(x+34\right)-\left(x+3\right)}{\left(x+3\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow x+34-x-3=x\)
\(\Leftrightarrow x=31\)
NN
16 tháng 8 2020
\(ĐKXĐ\): \(x\ne-3\); \(x\ne-10\); \(x\ne-21\); \(x\ne-34\)
\(\frac{7}{\left(x+3\right)\left(x+10\right)}+\frac{11}{\left(x+10\right)\left(x+21\right)}+\frac{13}{\left(x+21\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow\frac{1}{x+3}-\frac{1}{x+10}+\frac{1}{x+10}-\frac{1}{x+21}+\frac{1}{x+21}-\frac{1}{x+34}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow\frac{1}{x+3}-\frac{1}{x+34}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Leftrightarrow\frac{\left(x+34\right)-\left(x+3\right)}{\left(x+3\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
\(\Rightarrow\left(x+34\right)-\left(x+3\right)=x\)
\(\Leftrightarrow x+34-x-3=x\)
\(\Leftrightarrow x=31\)( thỏa mãn )
Vậy \(x=31\)
TT
0
HN
5
11 tháng 7 2019
\(b,\left(15-x\right)+\left(x-12\right)=7-\left(-8-x\right)\)
\(\Leftrightarrow15-x+x-12=7+8+x\)
\(\Leftrightarrow3=15+x\)
\(\Leftrightarrow x=3-15\)
\(\Leftrightarrow x=-12\)
Vậy : \(x=-12\)
NB
11 tháng 7 2019
Mik sửa lại câu a cho bạn Đạt này
A. 34 + (9 - 21)= 3417 - (x + 3417)
<=>34 + (-12) = 3417 - x - 3417
<=>22 = -x
=> x = -22
Vậy x= -22
\(\frac{-7}{x}=\frac{-21}{\left(x-34\right)}\)
\(\Leftrightarrow\frac{\left(x-34\right)}{-21}=\frac{x}{-7}\)
\(\Leftrightarrow\frac{\left(x-34\right)}{-21}=\frac{x}{-7}\)
\(\Leftrightarrow\frac{\left(x-34\right)}{-21}=\frac{3x}{-21}\)
\(\Leftrightarrow x-34=3x\)
\(\Leftrightarrow x-3x=34\)
\(\Leftrightarrow x\left(1-3\right)=34\)
\(\Leftrightarrow x\left(-2\right)=34\)
\(\Leftrightarrow x=34:\left(-2\right)=-17\)