如题所述
198*35
=(200-2)*35
=200*35-2*35
=7000-70
=6930
125*72*7
=(125*8)*(9*7)
=1000*63
=6300
57*16+44*16-16
=(57+44-1)*16
=100*16
=1600
=(200-2)*35
=200*35-2*35
=7000-70
=6930
125*72*7
=(125*8)*(9*7)
=1000*63
=6300
57*16+44*16-16
=(57+44-1)*16
=100*16
=1600
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