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(\(\frac{5}{7}-y\)) x \(\frac{14}{5}=\frac{6}{5}\)
\(\frac{5}{7}-y\) = \(\frac{6}{5}:\frac{14}{5}\)
\(\frac{5}{7}-y\) = \(\frac{3}{7}\)
y = \(\frac{5}{7}-\frac{3}{7}\)
y = \(\frac{2}{7}\)
\(\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\Leftrightarrow\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{5}{10}\)
\(\Leftrightarrow\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{6}{5}\)
\(\Leftrightarrow\frac{5}{7}-y=\frac{6}{5}\div\frac{14}{5}\)
\(\Leftrightarrow\frac{5}{7}-y=\frac{3}{7}\)
\(\Rightarrow y=\frac{5}{7}-\frac{3}{7}=\frac{2}{7}\)
\(\left(\frac{5}{7}:y\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\frac{5}{7}:y\cdot\frac{14}{5}=\frac{7}{10}+\frac{5}{10}\)
\(\frac{5}{7}\cdot\frac{14}{5}:y=\frac{12}{10}\)
\(2:y=\frac{12}{10}\)
\(y=2:\frac{12}{10}\)
\(y=2\cdot\frac{10}{12}\)
\(y=\frac{5}{3}\)
Câu này trong Violympic chứ gì !? Mình đọc lại đề bài thì thấy sai, mình sửa lại thành: Tìm y biết \(\left(\frac{5}{7}-y\right)\times\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\left(\frac{5}{7}-y\right)\times\frac{14}{5}=\frac{7}{10}+\frac{5}{10}\)
\(\left(\frac{5}{7}-y\right)\times\frac{14}{5}=\frac{12}{10}\)
\(\frac{5}{7}-y=\frac{12}{10}:\frac{14}{5}\)
\(\frac{5}{7}-y=\frac{3}{7}\)
\(y=\frac{5}{7}-\frac{3}{7}\)
\(y=\frac{2}{7}\)
Bạn Mai Thanh Xuân sai rồi nha
\(\left(\frac{5}{7}-y\right)x\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\left(\frac{5}{7}-y\right)x\frac{14}{5}=\frac{6}{5}\)
\(\frac{5}{7}-y=\frac{6}{5}:\frac{14}{5}\)
\(\frac{5}{7}-y=\frac{3}{7}\)
Y = \(\frac{5}{7}-\frac{3}{7}\)
Y = \(\frac{2}{7}\)
\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{6}{5}\)
\(\frac{5}{7}-y=\frac{6}{5}\div\frac{14}{5}\)
\(\frac{5}{7}-y=\frac{3}{7}\)
\(y=\frac{5}{7}-\frac{3}{7}\)
\(y=\frac{2}{7}\)
a)100-9:(372:3.y-1)-14=83
<=>100-9:(124y-1)-14=83
<=>86-9:(124y-1)=83
<=>9:(124y-1)=3
<=>124y-1=3
<=>124y=4
<=>y=\(\frac{1}{31}\approx0,3223\)
b)7260-120:24.y+924=528,3
<=>8184-5y=528,3
<=>5y=7655,7
<=>y=1531,14
c)2000-52:(615:3:y-15)-14=1984
<=>1986-52:(205:y-15)=1984
<=>52:(205:y-15)=2
<=>205:y-15=26
<=>205:y=41
<=>y=5
d)y+y.1/3+5/18=7/18
<=>4/3y=1/9
<=>y=1/12
e)13/15-(5/21+y)7/12=7/10
<=>7/12.(5/21+y)=1/6
<=>5/36+7/12y=1/6
<=>7/12y=1/36
<=>y=1/21\(\approx\)0,4762
h)y+2.y+3.y+...+10.y=49,5
<=>55y=49,5
<=>y=0,9
i)y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12)=1/24
<=>7991,364899y=1/24
<=>y=33/6329161
tích nha mỏi tay quá
\(\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{1}{2}=\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{6}{5}\)\(\frac{6}{5}\)
\(=>\frac{5}{7}-y=\frac{6}{5}\) / \(\frac{14}{5}=\frac{5}{7}-y=\frac{3}{7}=\frac{5}{7}-\frac{3}{7}=\frac{2}{7}\)
\(=>y=\frac{2}{7}\)
( 5/7 - y ) * 14/5 = 7/10 + 1/2
( 5/7 - y ) x 14/5 = 6/5
5/7 - y = 6/5 : 14/5
5/7 - y = 3/7
y = 5/7 - 3/7
y = 2/7
bằng 2/7