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Math problem in the fourth grade of primary school: how to skillfully calculate 20*36* 12?
Original formula =20* 12*(30+6)

=20* 12*30+20* 12*6

=600* 12+ 120* 12

=600*( 10+2)+ 120*( 10+2)

=600* 10+600*2+ 120* 10+ 120*2

=6000+ 1200+ 1200+240

=8640

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