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TN
2
29 tháng 4 2015
a) \(\frac{7}{10}-y\cdot\frac{3}{4}=\frac{1}{5}\)
\(y\cdot\frac{3}{4}=\frac{7}{10}-\frac{1}{5}\)
\(y\cdot\frac{3}{4}=\frac{1}{2}\)
\(y=\frac{1}{2}:\frac{3}{4}\)
\(y=\frac{1}{2}\cdot\frac{4}{3}\)
\(y=\frac{2}{3}\)
b) \(\frac{5}{6}:\left(y+\frac{7}{9}\right)=\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}:\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}\cdot\frac{4}{3}\)
\(y+\frac{7}{9}=\frac{10}{9}\)
\(y=\frac{10}{9}-\frac{7}{9}\)
\(y=\frac{3}{9}=\frac{1}{3}\)
**** !
21 tháng 4 2021
a, \(\frac{7}{10}-y\times\frac{3}{4}=\frac{1}{5}\)
\(\Rightarrow y\times\frac{3}{4}=\frac{7}{10}-\frac{1}{5}\)
\(\Rightarrow y\times\frac{3}{4}=\frac{1}{2}\)
\(\Rightarrow y=\frac{1}{2}\div\frac{3}{4}\)
\(\Rightarrow y=\frac{1}{3}\)
b, \(\frac{5}{6}\div\left(y+\frac{7}{9}\right)=\frac{3}{4}\)
\(\Rightarrow y+\frac{7}{9}=\frac{5}{6}\div\frac{3}{4}\)
\(\Rightarrow y+\frac{7}{9}=\frac{10}{9}\)
\(\Rightarrow y=\frac{10}{9}-\frac{7}{9}\)
\(\Rightarrow y=\frac{1}{3}\)
TT
3
HM
7 tháng 5 2017
a) 7/10 - y × 3/4 = 1/5
y × 3/4 = 7/10 - 1/5
y × 3/4 = 1/2
y = 1/2 : 3/4
y = 2/3. Vậy y = 2/3
b) 5/6 : ( y + 7/9 ) = 3/4
y + 7/9 = 5/6 : 3/4
y + 7/9 = 10/9
y. = 10/9 - 7/9
y = 1/3. Vậy y = 1/3
7 tháng 5 2017
\(\frac{7}{10}\)- y * \(\frac{3}{4}\)= \(\frac{1}{5}\)
y * \(\frac{3}{4}\)= \(\frac{7}{10}\)- \(\frac{1}{5}\)
y * \(\frac{3}{4}\)= \(\frac{1}{2}\)
y = \(\frac{1}{2}\): \(\frac{3}{4}\)
y = \(\frac{2}{3}\)
Vậy y = \(\frac{2}{3}\)
\(\frac{5}{6}\): ( y + \(\frac{7}{9}\)) = \(\frac{3}{4}\)
y + \(\frac{7}{9}\) = \(\frac{5}{6}\): \(\frac{3}{4}\)
y + \(\frac{7}{9}\) = \(\frac{10}{9}\)
y = \(\frac{10}{9}\)- \(\frac{7}{9}\)
y = \(\frac{3}{9}\)
Vậy y = \(\frac{3}{9}\)
17 tháng 5
Lớp học online hay j mà lắm giáo viên thế🤔🤔 Lớp học của tri thức à?
7 tháng 8 2016
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
H
21 tháng 5 2023
`(y+2/9) xx 1/5 = 7/15`
`=> y +2/9 = 7/15 : 1/5`
`=> y +2/9 = 7/15 xx 5`
`=> y +2/9= 35/15`
`=> y= 35/15 -2/9`
`=> y= 7/3 -2/9`
`=> y= 21/9-2/9`
`=> y= 19/9`
Vậy `y=19/9`
__
`yxx(12/7 +4/3) = 5/6`
`=> y xx 64/21 = 5/6`
`=> y= 5/6 : 64/21`
`=> y=5/6 xx 21/64`
`=> y=35/128`
Vậy `y= 35/128`
Y
21 tháng 5 2023
\(\left(y+\dfrac{2}{9}\right)\times\dfrac{1}{5}=\dfrac{7}{15}\)
\(y+\dfrac{2}{9}=\dfrac{7}{15}:\dfrac{1}{5}\)
\(y+\dfrac{2}{9}=\dfrac{7}{15}\times5\)
\(y+\dfrac{2}{9}=\dfrac{7}{3}\)
\(y=\dfrac{7}{3}-\dfrac{2}{9}\)
\(y=\dfrac{21}{9}-\dfrac{2}{9}\)
\(y=\dfrac{19}{9}\)
========================
\(y\times\left(\dfrac{12}{7}+\dfrac{4}{3}\right)=\dfrac{5}{6}\)
\(y\times\left(\dfrac{36}{21}+\dfrac{28}{21}\right)=\dfrac{5}{6}\)
\(y\times\dfrac{64}{21}=\dfrac{5}{6}\)
\(y=\dfrac{5}{6}:\dfrac{64}{21}\)
\(y=\dfrac{5}{6}\times\dfrac{21}{64}\)
\(y=\dfrac{35}{128}\)
VL
0
\(\frac{7}{y}=\frac{1}{12}\)
\(=>\frac{7}{y}=\frac{7}{84}\)
\(=>y=84\)
\(\frac{9}{10}-y.\frac{3}{4}=\frac{2}{5}\)
\(y.\frac{3}{4}=\frac{9}{10}-\frac{2}{5}=\frac{1}{2}\)
\(y=\frac{1}{2}:\frac{3}{4}\)
\(y=\frac{1}{2}.\frac{4}{3}\)
\(y=\frac{2}{3}\)
\(\frac{5}{6}:\left[y+\frac{7}{9}\right]=\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}:\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}.\frac{4}{3}\)
\(y+\frac{7}{9}=\frac{10}{9}\)
\(y=\frac{10}{9}-\frac{7}{9}\)
\(y=\frac{3}{9}\)
\(y=\frac{1}{3}\)
1, 7/y=1/12
=>7.12=y
=>y=84
2, 9/10-y.3/4=2/5
=>y.3/4=9/10-2/5
=>y.3/4=1/2
=>y=1/2:3/4=2/3
3, 5/6[y+7/9]=3/4
=>y+7/9=5/6:3/4
=>y+7/9=10/9
=>y=10/9-7/9
=>y=1/3