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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 ~
\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)
\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)
\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)
\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)
\(\frac{1}{2}+\frac{1}{3}\cdot\frac{1}{5}:\frac{2}{3}\)
\(=\frac{1}{2}+\frac{1}{3}\cdot\frac{3}{10}\)
\(=\frac{1}{2}+\frac{1}{10}\)
\(=\frac{3}{5}\)
chúc bạn học tốt nhé ^..^
\(\frac{2}{3}\div\frac{1}{2}+\frac{1}{23}\div\frac{1}{2}\)
=\(\left(\frac{2}{3}+\frac{1}{23}\right)\div\frac{1}{2}\)
=\(\frac{49}{69}\div\frac{1}{2}\)
=\(\frac{98}{69}\)
#dapandungchicomot#
\(\frac{1}{3}:\frac{6}{7}+\frac{3}{4}:\frac{6}{7}=\frac{1}{3}.\frac{7}{6}+\frac{3}{4}.\frac{7}{6}=\frac{7}{6}.\left(\frac{1}{3}+\frac{3}{4}\right)=\frac{7}{6}.\frac{13}{12}=\frac{91}{72}\)
1/3:6/7+3/4:6/7=(1/3+3/4):6/7=13/12:6/7=13/12x7/6=51/72
\(\frac{3}{5}\times\frac{7}{9}+\frac{15}{18}\times\frac{2}{5}\)
\(=\frac{21}{45}+\frac{30}{90}\)
\(=\frac{4}{5}\)
#Hoktot#
theo mình đoán là:
y = 60
chúc bạn học tốt !!!
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 !!!