bn nguyễn khánh đan giải hẳn ra giúp mik đc ko
\(4\times5\times0,25\times\dfrac{1}{5}\times\dfrac{1}{2}\times2\)
\(=\left(4\times0,25\right)\times\left(5\times\dfrac{1}{5}\right)\times\left(\dfrac{1}{2}\times2\right)\)
\(=1\times\dfrac{5}{5}\times\dfrac{2}{2}\)
\(=1\times1\times1\)
\(=1\)