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Ta có : y . 45 + y . 55 = 1000
y ( 45 + 55 ) = 1000
y . 100 = 1000
y = 1000 : 100
y = 10
Vậy y = 10
y.45+y.55=1000
y.(45+55)=1000
y. 100 =1000
y =1000:100
y =10
Vậy y=10
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.16307:y=45\left(dư\text{ }17\right)\)\(\Leftrightarrow45\text{×}y+17=16307\)
\(45\text{×}y=16307-17\)
\(45\text{×}y=16290\)
\(y=16290:45\)
\(y=362\)
\(b.y\text{×}52+y\text{×}48=36700\)
\(y\text{×}\left(52+48\right)=36700\)
\(y\text{×}100=36700\)
\(y=36700:100\)
\(y=367\)
a) 16307= 45*y+17 -> y=(16307-17)/45= 362
b) y*(52+48)= 36700 -> y=36700/100= 367
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 7875 : x = 45
x = 7875 : 45
x = 7875 : 45
b, y : 12 = 352
y = 352 x 12
y = 4224
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\(a,\frac{42}{25}:\frac{y}{5}=\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}:\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}\times\frac{5}{6}\)
\(\frac{y}{5}=\frac{7}{5}\)
\(\Leftrightarrow5y=7.5\)
\(5y=35\)
\(y=7\)
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Mk trả lời thiếu, chờ 1 lát
a) 3,7 x y + 5,28 = 14,9
3,7 x y= 9,62
y = 9,62 : 3,7
y = 2,6
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\(\frac{42}{y}=\frac{18}{21}\)
\(\Rightarrow y\times18=42\times21\)
\(\Rightarrow y\times18=882\)
\(\Rightarrow y=882:18\)
\(\Rightarrow y=49\)
Vậy \(y=49\)
\(\frac{y}{14}=\frac{25}{35}\)
\(\Rightarrow y\times35=25\times14\)
\(\Rightarrow y\times35=350\)
\(\Rightarrow y=350:35\)
\(\Rightarrow y=10\)
Vậy \(y=10\)
a,\(\frac{42}{y}=\frac{18}{21}\)=> \(18y=882=>y=49\)
b,\(\frac{y}{14}=\frac{25}{35}< =>\frac{y}{14}=\frac{5}{7}=>7y=70=>y=10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,+) 4/x=12/15
=>15*4=12*x
=>60=12*x
=>x=5;có 4/x=y/45
=>4/5=y/45
=>36/45=y/45
=>y=36
Vậy x=5:y=36
b,3/x=1/y=6/24
=>3/x=1/y=1/4
có: 1/y=1/4
=>y=4
có: 1/4=3/x
=>1x=3*4
=>x=12
Vây x=12
y=4
hok tot
a) \(\frac{4}{5}=\frac{12}{15}=\frac{36}{45}\)
Tự giải quyết nốt =))
3600:y=5600:70
3600:y=80
y=3600:80
y=45
Vậy đáp án đúng là y=45.
Đáp án C