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x + 1/2 = 3/4
x = 3/4 - 1/2
x = 1/4
Vậy, x = 1/4
T.i.c.k cho mik nha!
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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
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6/13:1/(2+y) =15/39
<=> (12+6y)/13=15/39
<=> 468+234y=195
<=>234y=-273
<=> y=-7/6
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\(\frac{6}{13}\div\left(\frac{1}{2}+y\right)=\frac{15}{39}\)
\(\frac{1}{2}+y=\frac{6}{13}\div\frac{15}{39}\)
\(\frac{1}{2}+y=\frac{6}{5}\)
\(y=\frac{6}{5}-\frac{1}{2}\)
\(y=\frac{7}{10}\).
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\(\dfrac{3}{4}\cdot\dfrac{2}{5}-\dfrac{3}{4}\cdot\dfrac{2}{7}\)
= \(\dfrac{3}{4}\cdot\left(\dfrac{2}{5}-\dfrac{2}{7}\right)\)
= \(\dfrac{3}{4}\cdot\left(\dfrac{14}{35}-\dfrac{10}{35}\right)\)
= \(\dfrac{3}{4}\cdot\dfrac{4}{35}\)
= \(\dfrac{3}{35}\)
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a, 3/22 x 3/11 x 22
Cách 1
3/22 x 3/11 x 22 = 9/242 x 22
= 198/242
= 9/11
Cách 2
3/22 x 3/11 x 22 = 3 x 3 x 22/22 x 11 x 1
= 9/11
b,( 1/2 + 1/3) x 2/5
Cách 1
( 1/2 + 1/3 ) x 2/5 = 5/6 x 2/5
= 10/30
= 1/3
Cách 2
( 1/2 +1/3) x 2/5 = 1/2 x 2/5 + 1/3 x 2/5
= 2/10 + 2/15
= 1/5 + 2/15
= 3/15 + 2/15
= 5/15
= 1/3
c, 3/5 x 17/21 + 17/21 x 2/5
Cách 1
3/5 x 17/21 + 17/21 x 2/5 = 51/105 + 34/105
= 85/105
= 17/21
Cách 2
3/5 x 17/21 + 17/21 x 2/5 = 17/21 x (3/5 +2/5)
= 17/21 x 5/5
= 17/21 x 1
= 17/21
HỌC TỐT ( k mk nhé)
\(y\times4+\dfrac{y}{3}=39\)
\(y\times\left(4+\dfrac{1}{3}\right)=39\)
\(y\times\dfrac{13}{3}=39=>y=39\times\dfrac{3}{13}=9\)
y.4+y.3=39
y.(3+4)=39
y.7=39
y=39:7
y=39/7