\(25\%\times6,28+\dfrac{1}{4}\times6,28+0,25\times6,28\\ =6,28\times\left(25\%+\dfrac{1}{4}+0,25\right)\\ =6,28\times\left(\dfrac{1}{4}+\dfrac{1}{4}+\dfrac{1}{4}\right)\\ =6,28\times\dfrac{1+1+1}{4}\\ =6,28\times\dfrac{3}{4}\\ =4,71\)
Đổi 25%,1/4=0,25 ta có:
0,25×6,28+0,25×6,28+0,25×6,28
6,28×(0,25+0,25+0,25
6,28×0,75=4,71
\(25\%\times6,28+\dfrac{1}{4}\times6,28+0,25\times6,28\)
\(=\dfrac{1}{4}\times\dfrac{157}{25}+\dfrac{1}{4}\times\dfrac{157}{25}+\dfrac{1}{4}\times\dfrac{157}{25}\)
\(=\dfrac{1}{4}\times\left(\dfrac{157}{25}+\dfrac{157}{25}+\dfrac{157}{25}\right)\)
\(=\dfrac{1}{4}\times\dfrac{157+157+157}{25}\)
\(=\dfrac{1}{4}\times\dfrac{471}{25}\)
\(=\dfrac{1\times471}{4\times25}\)
\(=\dfrac{471}{100}=4,71\)