3$\frac{9}{100}$ viết dưới dạng số thập phân là:

Đặt tính rồi tính:  

a)          4,75 x 1,3                                                                      b) 72,58 : 19

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6km 23dam = . . . . . . . . . . . . km                      4 tấn 25yến = . . . . . . . . tấn

2m² 7dm² = . . . . . . . . . . . . m²                          69m 5cm = . . . . . . . . . . m