tìm x biết
[ 1/2 - 1/3 + 1/4 ] : [ 1/6 - 1/x ] = 17,5
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\(\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}}{\frac{1}{6}-\frac{1}{x}}=17.5\)
\(\frac{\frac{1}{6}+\frac{1}{4}}{\frac{1}{6}-\frac{1}{x}}=\frac{35}{2}\)
\(\frac{\frac{5}{12}}{\frac{1}{6}-\frac{1}{x}}=\frac{35}{2}\)
\(\frac{1}{6}-\frac{1}{x}=\frac{\frac{5}{12}}{\frac{35}{2}}\)
\(\frac{1}{6}-\frac{1}{x}=\frac{\frac{5}{12}}{\frac{35}{2}}\)
\(\frac{1}{6}-\frac{1}{x}=\frac{1}{42}\)
\(\frac{1}{x}=\frac{1}{6}-\frac{1}{42}\)
\(\frac{1}{x}=\frac{1}{7}\)
\(\Rightarrow x=7\)
CHÚC BẠN HỌC TỐT!!! :))
( 1/2 - 1/3 + 1/4 ) : ( 1/6 - 1/x ) = 17,5
( 6/12 - 4/12 + 3/12 ) : ( 1/6 - 1/x) = 17,5
5/12 : ( 1/6 - 1/x ) = 17,5
1/6 : 1/ x = 5/12 : 17,5
1/6 : 1/ x = 1/42
1/x = 1/6 : 1/42
1/x = 7
1 : x = 7
x = 1:7
x= 1/7
\(\left[\frac{1}{2}-\frac{1}{3}+\frac{1}{4}\right]:\left[\frac{1}{6}-\frac{1}{x}\right]=17,5\)
\(\Rightarrow\frac{5}{12}:\left[\frac{1}{6}-\frac{1}{x}\right]=\frac{35}{2}\)
\(\Rightarrow\frac{1}{6}-\frac{1}{x}=\frac{5}{12}:\frac{35}{2}\)
\(\Rightarrow\frac{1}{6}-\frac{1}{x}=\frac{1}{42}\)
\(\Rightarrow\frac{1}{x}=\frac{1}{6}-\frac{1}{42}\)
\(\Rightarrow\frac{1}{x}=\frac{1}{7}\)
\(\Rightarrow x=1:\frac{1}{7}\)
\(\Rightarrow x=7\)
Học tốt # ^-<
b) y/8 + 8y - 56,78 = 69,11 . 2
y/8+ 64y/8 = 138.22+ 56.78
65y/8 =195
65y= 1560
y= 24
\(\frac{6-4+3}{12}\): \(\frac{x-6}{6x}\)= 17,5 <=>\(\frac{\left(6-4+3\right).6x}{12\left(x-6\right)}\)= 17,5
\(30x\)= 17,5.\(12\)(x - 6)
30x = 210x - 105 => 180x = 105 => x = \(\frac{105}{180}\)= \(\frac{21}{36}\)