Xiao Ming de Jia mathematics Xiao classroom - Training Enrollment Network

Xiao Ming de Jia mathematics Xiao classroom

(1) First, determine the appropriate proportion.

12cm:6m = 12cm:600cm = 1:50

4mx (1:50) = 0.08m = 8cm

Length drawn on paper = 12cm, width = 8cm；;

(2) Calculate the ratio between the drawing area and the actual living room area.

The ratio of the area on the drawing to the actual area = 12x8cm? :6x4m？ = 12x8cm？ :6x4x 10000cm？ = 1:2500= 1:50? ,

1m？ = 10000cm？

The ratio of the area on the map to the actual area = the square (ratio)

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A mathematical geometry in grade three, I hope the master can help me choose a three-dimensional problem and explain why! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !