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4678×4679+4680×314648=1494441002
4680×4679-4678×4679=9358
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 1,28:0,125+1,28×0,25+1,28×1,75
=1,28x(8+0,25+1,75)
=1,28x10=12,8
b) bạn nên viết rõ ra
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4678\times4679+4680\times31+4648}{4680\times4679-4678\times4679}\)
\(\Leftrightarrow\frac{4679\times4678+4679\times31+4679}{4679\times\left(4680-4678\right)}\)
\(=\frac{4679\times\left(4678+31+1\right)}{4679\times2}\)
\(=\frac{4679\times4710}{4679\times2}\)
\(=\frac{4710}{2}\)
\(=2355\)
\(\frac{4678\cdot4679+4680\cdot31+4648}{4680\cdot4679-4678.4679}\)=\(\frac{4678\cdot4679+\left(4680-1\right)\cdot31+4648+31}{4680\cdot4679-4678.4679}\)
=\(\frac{4678\cdot4679+4679\cdot31+4679}{4680\cdot4679-4678.4679}\)=\(\frac{\left(4678+31+1\right)\cdot4679}{\left(4680-4678\right).4679}\)=\(\frac{4710}{2}\)=2355
![](https://rs.olm.vn/images/avt/0.png?1311)
1349x4678=6310622
TK MK NHA MK ĐANG ÂM ĐIỂM NÈ HU HU
CHÚC BẠN HỌC GIỎI
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4678.4679+4680.31+4648}{4680.4679-4687.4679}\)
\(=\frac{4678.4679+4679.31+(31+4648)}{4679.\left(4680-4687\right)}\)
\(=\frac{4678.4679+4679.31+4679}{4679.\left(-7\right)}\)
\(=\frac{4679.\left(4678+31+1\right)}{4679.\left(-7\right)}\)
\(=\frac{4679.4710}{4679.\left(-7\right)}=\frac{4710}{-7}=\frac{-4710}{7}\)
lp 5 chưa hok đến số âm, nhưng bài này lại ra kp âm! nên b xem lại đề giúp mk nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(=\dfrac{4678^2+4678+4678\cdot31+2\cdot31+4648}{4678^2+3\cdot4678+2-4678^2-4678}\)
\(=\dfrac{4678^2+4678\cdot32+4678+32}{2\cdot4678+2}=\dfrac{4678\left(1+4678\right)+32\cdot4679}{2\left(4678+1\right)}\)
\(=\dfrac{4678+32}{2}=2355\)
= \(\dfrac{31+4648}{4679}\)
= \(\dfrac{4679}{4679}\)= 1