Tìm X, biết: 29 – (209/10 x X – 80) : 2010 / 29 = 0
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29 - ( 209/10 * x - 80 ) : 2010/29 = 0
( 209/10 * x - 80 ) : 2010/29 = 29 - 0
( 209/10 * x - 80 ) : 2010/29 = 29
( 20,9 * x -80 ) = 29 * 2010/ 29
( 20,9 * x -80 ) = 2010
20,9 * x = 2010 + 80
20,9 * x = 2090
x = 2090 : 20,9
x = 100
29 - ( 209/10 * x - 80 ) : 2010/29 = 0
( 209/10 * x - 80 ) : 2010/29 = 29 - 0
( 209/10 * x - 80 ) : 2010/29 = 29
( 20,9 * x -80 ) = 29 * 2010/ 29
( 20,9 * x -80 ) = 2010
20,9 * x = 2010 + 80
20,9 * x = 2090
x = 2090 : 20,9
x = 100
HOK TỐT
29 - (\(\frac{209}{10}\)*X - 80 ) : \(\frac{2010}{29}\)=0
giải
(\(\frac{209}{10}\)* X - 80 ) : \(\frac{2010}{29}\)= 29
\(\frac{209}{10}\)* X - 80 )=29 x \(\frac{2010}{29}\)
\(\frac{209}{10}\)* X - 80 = 2010
\(\frac{209}{10}\)* X = 2010 + 80
\(\frac{209}{10}\)* X= 2090
X= 2090 : \(\frac{209}{10}\)
X= 2090 * \(\frac{10}{209}\)
X=100
\(29-\left(\frac{209}{10}x-80\right)=0\)
\(\Leftrightarrow\frac{209}{10}x-80=29\)
\(\Leftrightarrow\frac{209}{10}x=109\Leftrightarrow x=\frac{1090}{209}\)
1,7-(18+x)=-15
<=>18+x=7+15
<=>18+x=22
<=>x=4
2,(x-17)-(-3)=0
<=>x-17+3=0
<=>x-17=-3
,<=>x=14
<=>
1,
7 - ( 18 + x ) = - 15
18 + x = 7 + 15
18 + x = 22
x = 22 - 18
x = 4
2,
( x - 17 ) - ( - 3 ) = 0
( x - 17 ) + 3 = 0
x - 17 = - 3
x = -3 + 17
x = 14
3, -18 - ( x - 6 ) = 0
-18 = x- 6
x = - 18 + 6
x = - 12
4, 29 - ( 10 + 29 ) = x - ( 27 - 9 )
-10 = x - 18
x = - 10 + 18
x = 8
a) -18-(x-6)=0
x-6=(-18)-0
x-6=-18
x = (-18)+6
x = -12
b) 29-(10+29)=x-(27-9)
29-39 = x-18
-10 =x-18
x-18=-10
x = (-10)+18
x = 8
Học tốt
a,\(7-\left(18+x\right)=-15\)
\(18+x=7-\left(-15\right)\)
\(18+x=22\)
\(x=4\)
b,\(\left(x-17\right)-\left(-3\right)=0\)
\(x-17=-3\)
\(x=14\)
c,\(-18-\left(x-6\right)=0\)
\(x-6=-18\)
\(x=-12\)
d,\(29-\left(10+29\right)=x-\left(27-9\right)\)
\(x-18=-10\)
\(x=8\)
a) \(7-\left(18+x\right)=-15\)
\(\Leftrightarrow18+x=7+15\)
\(\Leftrightarrow18+x=22\)
\(\Leftrightarrow x=22-18\)
\(\Leftrightarrow x=4\)
b) \(\left(x-17\right)-\left(-3\right)=0\)
\(\Leftrightarrow\left(x-17\right)+3=0\)
\(\Leftrightarrow x-17=0-3\)
\(\Leftrightarrow x-17=-3\)
\(\Leftrightarrow x=-3+17\)
\(\Leftrightarrow x=14\)
c) \(-18-\left(x-6\right)=0\)
\(\Leftrightarrow x-6=0+\left(-18\right)\)
\(\Leftrightarrow x-6=-18\)
\(\Leftrightarrow x=-18+6\)
\(\Leftrightarrow x=-12\)
d) \(29-\left(10+29\right)=x-\left(27-9\right)\)
\(\Leftrightarrow29-10-29=x-27+9\)
\(\Leftrightarrow-10=x-27+9\)
\(\Leftrightarrow x-27=-10-9\)
\(\Leftrightarrow x-27=-19\)
\(\Leftrightarrow x=-19+27\)
\(\Leftrightarrow x=8\)
a, bổ sung đề
\(\dfrac{29-x}{21}+1+\dfrac{27-x}{23}+1+\dfrac{25-x}{25}+1+\dfrac{23-x}{27}+1+\dfrac{21-x}{29}+1=0\)
\(\Leftrightarrow\dfrac{50-x}{21}+\dfrac{50-x}{23}+\dfrac{50-x}{25}+\dfrac{50-x}{27}+\dfrac{50-x}{29}=0\)
\(\Leftrightarrow\left(50-x\right)\left(\dfrac{1}{21}+\dfrac{1}{23}+\dfrac{1}{25}+\dfrac{1}{27}+\dfrac{1}{29}\ne0\right)=0\Leftrightarrow x=50\)