Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
4678×4679+4680×314648=1494441002
4680×4679-4678×4679=9358
\(\frac{4678\times4679+4680\times31+4648}{4680\times4679-4678\times4679}\)
\(\Leftrightarrow\frac{4679\times4678+4679\times31+4679}{4679\times\left(4680-4678\right)}\)
\(=\frac{4679\times\left(4678+31+1\right)}{4679\times2}\)
\(=\frac{4679\times4710}{4679\times2}\)
\(=\frac{4710}{2}\)
\(=2355\)
\(\frac{4678\cdot4679+4680\cdot31+4648}{4680\cdot4679-4678.4679}\)=\(\frac{4678\cdot4679+\left(4680-1\right)\cdot31+4648+31}{4680\cdot4679-4678.4679}\)
=\(\frac{4678\cdot4679+4679\cdot31+4679}{4680\cdot4679-4678.4679}\)=\(\frac{\left(4678+31+1\right)\cdot4679}{\left(4680-4678\right).4679}\)=\(\frac{4710}{2}\)=2355
1,28:0,125+1,28.0,25+1,8.1,75
=1,28.\(\frac{1}{8}\)+1,28.\(\frac{1}{4}\)+1,8.\(\frac{7}{10}\)
=1,28\(\left(\frac{1}{8}+\frac{1}{4}\right)\)+\(\frac{9}{5}\).\(\frac{7}{10}\)
=1,28\(\left(\frac{1}{8}+\frac{2}{8}\right)\)+\(\frac{63}{50}\)
=\(\frac{32}{25}\cdot\frac{3}{8}+\frac{63}{50}\)
\(=\frac{12}{25}\)
\(=\frac{19}{4}+\left(-0.37\right)+\frac{1}{8}+\left(-1.28\right)+\left(-2.5\right)+\frac{37}{12}\)\(\frac{37}{12}\)
\(=\left(\frac{19}{4}+\frac{1}{8}+\frac{37}{12}\right)+\left(\left(-0.37\right)+\left(-1.28\right)+\left(-2.5\right)\right)\)
\(=\frac{191}{24}+\left(-\frac{83}{20}\right)\)
\(=\frac{457}{120}\)
Các bạn viết hẳn ra ạ
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