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42+y/76=153/171
y/76=153/171-42
y/76=-781/19
y=-781/19*76
y=-3124
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{42+y}{76}=\frac{153}{171}=\frac{17}{19}\)
\(\Rightarrow\left(42+y\right)\times19=76\times17\)
\(\left(42+y\right)\times19=1292\)
\(42+y=1292:19\)
\(42+y=68\)
\(y=68-42\)
\(y=26\)
CHÚC BN HỌC TỐT!!!!!!!
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\(\frac{42+y}{72}=\frac{153}{171}\)
\(\Rightarrow\left(42+y\right)\times171=76\times153\)
\(\Rightarrow\left(42+y\right)\times171=11628\)
\(\Rightarrow42+y=11628:171=68\)
\(\Rightarrow y=68-42=26\)
\(\frac{42+y}{76}=\frac{153}{171}\Rightarrow171\left(42+y\right)=153.76\Rightarrow7182+171y=11628\Rightarrow171y=4446\Rightarrow y=26\)
Vậy y = 26
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{42+y}{76}=\frac{153}{171}\)
\(\left(42+y\right):76=\frac{153}{171}\)
\(42+y=\frac{153}{171}\text{×}76\)
\(42+y=68\)
\(\Rightarrow y=68-42\)
\(\Rightarrow y=26\)
\(\frac{42+y}{76}=\frac{153}{171}\)
\(\left(42+y\right):76=\frac{153}{171}\)
\(42+y=\frac{153}{171}\text{×}76\)
\(42+y=68\)
\(\Rightarrow y=68-42\)
\(\Rightarrow y=26\)
![](https://rs.olm.vn/images/avt/0.png?1311)
42 + y/76 = 153/171
y/76=153/171 - 42
y/76 = 781/19
y = 3124
![](https://rs.olm.vn/images/avt/0.png?1311)
\(42+\frac{y}{76}=\frac{153}{171}\)
\(42+\frac{y}{76}=\frac{17}{19}\)
\(\frac{y}{76}=\frac{17}{19}-42\)(Chỗ này bạn tự quy đồng)
\(\frac{y}{76}=-\frac{781}{19}\)
\(\Rightarrow y=-781\times76:19=-3124\)
Bạn chưa học âm đâu?
![](https://rs.olm.vn/images/avt/0.png?1311)
42+x/76=153/171
x/76=42-153/171
x/76=5922/171-153/171
x/76=5769/171
x.171=76.5769
x.71=438444
x=438444:71
x=6175,...
vay x=6175,....
de bai sai xao y ban a
42 + Y/76 =153/171
Y/76 = 153/171 - 42
Y/76 = -781/19
Y= - 3124
OK
co dung ko day
d