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\(\frac{1}{2}+\frac{1}{3}\cdot\frac{1}{5}:\frac{2}{3}\)
\(=\frac{1}{2}+\frac{1}{3}\cdot\frac{3}{10}\)
\(=\frac{1}{2}+\frac{1}{10}\)
\(=\frac{3}{5}\)
chúc bạn học tốt nhé ^..^
y + y x 1/3 : 2/9 + y : 2/7 = 360
=> y + y x 1/3 x 9/2 + y x 7/2 = 360
=> y + y x 3/2 + y x 7/2 = 360
=> y x ( 1 + 3/2 + 7/2 ) = 360
=> y x 6 = 360
=> y = 360 : 6
=> y = 60
Vậy y = 60
Chúc bạn học tốt !!!
6/13:1/(2+y) =15/39
<=> (12+6y)/13=15/39
<=> 468+234y=195
<=>234y=-273
<=> y=-7/6
\(\frac{6}{13}\div\left(\frac{1}{2}+y\right)=\frac{15}{39}\)
\(\frac{1}{2}+y=\frac{6}{13}\div\frac{15}{39}\)
\(\frac{1}{2}+y=\frac{6}{5}\)
\(y=\frac{6}{5}-\frac{1}{2}\)
\(y=\frac{7}{10}\).
~ Chúc bạn hok tốt ~
\(\frac{3}{10}\div\frac{5}{9}+\frac{4}{15}\div\frac{1}{5}\)
\(=\frac{27}{50}+\frac{4}{3}\)
\(=\frac{281}{150}\)
\(\frac{1}{3}:\frac{6}{7}+\frac{3}{4}:\frac{6}{7}=\frac{1}{3}.\frac{7}{6}+\frac{3}{4}.\frac{7}{6}=\frac{7}{6}.\left(\frac{1}{3}+\frac{3}{4}\right)=\frac{7}{6}.\frac{13}{12}=\frac{91}{72}\)
1/3:6/7+3/4:6/7=(1/3+3/4):6/7=13/12:6/7=13/12x7/6=51/72
Ta có biểu thức :
\(M=\frac{11}{6}-\frac{5}{6}\div\left(m+\frac{3}{10}\right)\)
a ) Nếu \(m=\frac{1}{2}\) thì \(M=\frac{11}{6}-\frac{5}{6}\div\left(\frac{1}{2}+\frac{3}{10}\right)=\frac{5}{4}\)
b ) Nếu \(M=\frac{5}{3}\) thì
\(\frac{11}{6}-\frac{5}{6}\div\left(m+\frac{3}{10}\right)=\frac{5}{3}\)
\(1\div\left(m+\frac{3}{10}\right)=\frac{5}{3}\)
\(m+\frac{3}{10}=1\div\frac{5}{3}\)
\(m+\frac{3}{10}=\frac{3}{5}\)
\(m=\frac{3}{5}-\frac{3}{10}\)
\(m=\frac{3}{10}\)
\(\frac{2}{3}\div\frac{1}{2}+\frac{1}{23}\div\frac{1}{2}\)
=\(\left(\frac{2}{3}+\frac{1}{23}\right)\div\frac{1}{2}\)
=\(\frac{49}{69}\div\frac{1}{2}\)
=\(\frac{98}{69}\)
#dapandungchicomot#