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y : 2,5 = (42,8 + 5,38): 0,75
y : 2,5 = 48,18 : 0,75
y : 2,5 = 64,24
y = 64,24 x 2,5
y = 160,6
![](https://rs.olm.vn/images/avt/0.png?1311)
y : 2,5 = ( 42,8 + 5,38 ) : 0,75
y * 4 = 48,18 : 0,75
y * 4 = 64,24
y = 64,24 : 4
y = 16,06
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(y:72,5=42,8-6,9.\\ \Leftrightarrow y:72,5=35,9.\\ \Leftrightarrow y=2602,75.\)
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y/8+yx8-56,78=138,22
yx(1/8+8)-56,78=138,22
yx8,125=138,22+56,78
yx8,125=195
y=195:8,125
y=24
Vậy y=24. k mk nha
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y : 1/8 +y : 1/2 = 140 + 1/4
y x 8 + y x 2 = 140 + 1/4
y x ( 8 + 2) = 140 + 1/4
y x 10 = 140 + 1/4
Bạn tự giải nốt nhé
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Bài 4:
\(\dfrac{3}{4}+y:\dfrac{2}{5}=\dfrac{37}{16}\)
\(\Rightarrow y:\dfrac{2}{5}=\dfrac{37}{16}-\dfrac{3}{4}\)
\(\Rightarrow y:\dfrac{2}{5}=\dfrac{25}{16}\)
\(\Rightarrow y=\dfrac{2}{5}\cdot\dfrac{25}{16}\)
\(\Rightarrow y=\dfrac{5}{8}\)
________________
\(456+y:87=23987\)
\(\Rightarrow y:87=23987-456\)
\(\Rightarrow y:87=23531\)
\(\Rightarrow y=23531\cdot87\)
\(\Rightarrow y=2047197\)
a)\(\dfrac{4}{5}\times\dfrac{5}{8}:\dfrac{4}{5}\)
\(=\left(\dfrac{4}{5}:\dfrac{4}{5}\right)\times\dfrac{5}{8}\)
\(=1\times\dfrac{5}{8}=\dfrac{5}{8}\)
b)\(\dfrac{5}{6}+\left(\dfrac{1}{2}:\dfrac{3}{2}+\dfrac{4}{5}\right)\)
\(=\dfrac{5}{6}+\left(\dfrac{1}{3}+\dfrac{4}{5}\right)\)
\(=\dfrac{5}{6}+\dfrac{17}{15}\)
\(=\dfrac{59}{30}\)
Bài 2:
a) \(\dfrac{3}{4}+y:\dfrac{2}{5}=\dfrac{37}{16}\)
\(y:\dfrac{2}{5}=\dfrac{37}{16}-\dfrac{3}{4}\)
\(y:\dfrac{2}{5}=\dfrac{25}{16}\)
\(y=\dfrac{25}{16}\times\dfrac{2}{5}\)
\(y=\dfrac{5}{8}\)
b)\(456+y:87=23987\)
\(y:87=23987-456\)
\(y:87=23531\)
\(y=23531\times87\)
\(y=2047197\)
y x 87 + y x 8 - y = 42,8
y x ( 87 + 8 ) - y = 42,8
y x 95 - y = 42,8
y x 95 - y x 1 = 42,8
y x ( 95 - 1) = 42,8
y x 94 = 42,8
y = 42,8:94
y = 214/5 x 1/94
y =107/235