Question

Tính nhanh

25.36;35.4

Answer 1

25.36 = 25.4.9 = 100.9 = 900

35.4 = 7.5.4 = 7.20 = 7.2.10 = 14.10 = 140

Answer 2

25*36=25*40-25*4=1000-100=900

35*4=4*30+4*5=120+20=140

Answer 3

\(25\cdot36\)

\(=5^2\cdot6^2\)

\(=30^2\)

\(=900\)

\(35\cdot4\)

\(=5\cdot7\cdot2^2\)

\(=5\cdot2\cdot7\cdot2\)

\(=10\cdot14\)

\(=140\)