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345 x 87 + 690 x 5 + 1035
= 345 x 87 + 345 x 5 x 2 + 345 x 3
= 345 x 87 + 345 x 10 + 345 x 3
= 345 x (87 + 10 + 3)
= 345 x 100
= 34500
= 345 x 87 + 345 x 5 x 2 + 345 x 3
= 345 x 87 + 345 x 10 + 345 x 3
= 345 x (87 + 10 + 3)
= 345 x 100
= 34500
![](https://rs.olm.vn/images/avt/0.png?1311)
345 + 1035 x 5 - 5 x 690 - 345 x 5 + 1000
= 345 + ( 1035 - 690 - 345 ) x 5 + 1000
= 345 + 0 x 5 + 1000
= 345 + 0 + 1000
= 1345 Mong câu trả lời của mk giúp ích cho bn( )
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1000-345+345:y=655+345:y\)
\(y:2\times5+1234=2234\)
\(\Rightarrow y:2\times5=1000\)
\(\Rightarrow y:2=200\)
\(\Rightarrow y=400\)
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4x5x6/3x10x8=120/240=120:120/240:120=1/2 nha
~HT~
k cho mình nha
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\(\frac{4}{3}-\frac{14}{x}=\frac{2}{5}\)
\(\frac{14}{x}=\frac{4}{3}-\frac{2}{5}\)
\(\frac{14}{x}=\frac{14}{15}\)
\(\Rightarrow\)\(x=15\)
TL:
\(\frac{4}{3}\)- \(\frac{14}{x}\)= \(\frac{2}{5}\)
\(\frac{14}{x}\)= \(\frac{4}{3}\)- \(\frac{2}{5}\)
\(\frac{14}{x}\)= \(\frac{14}{15}\)
x = 15.
~HT~
238 + 1035 x 5 - 5 x 690 - 345 x 4 + 1000
= ( 238 + 1000 ) + 5 x ( 1035 - 690 - 345 )
= 1238 + 5 x 0
= 1238 + 0
= 1238
`238 + 1035 xx 5 - 5 xx 690 - 345 xx 5 + 1000`
`= ( 238 + 1000 ) + 5 xx ( 1035 - 690 - 345 )`
`= 1238 + 5 xx 0`
`= 1238`