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How to do the eighth question and 1 1 on page 27 of the special training for primary school mathematics class (the second volume of grade five)
(1)20*40*4*2=6400 (square centimeter)

(2)v=abh

=30*40*20

=24000 (cubic centimeter)

= 0.024 cubic meter

(3) The carpet is rectangular when unfolded.

Area: 20*30*4+30*40*3

=2400+3600

=6000 (square centimeter)

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