Question

tính nhanh:

\(\dfrac{12,48:0,5x6,25x4x2}{2x3,12x1,25:0,25x10}\)

Answer 1

Ghi đề dấu nhân rõ ràng ra nha

\(\dfrac{12,48:0,5\times6,25\times4\times2}{2\times3,12\times1,25:0,25\times10}\\ =\dfrac{12,48\times2\times6,25\times4\times2}{2\times3,12\times1,25\times4\times10}\\ =\dfrac{12,48}{3,12}\times\dfrac{2}{2}\times\dfrac{2}{10}\times\dfrac{6,25}{1,25}\times\dfrac{4}{4}\\ =4\times1\times\dfrac{1}{5}\times5\times1=4\)