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简介:
(1)12×(40-5)
=12×40-12×5
=480-60
=420
(2)64×9-14×9
=(64-14)×9
=50×9
=450
(3)35×98
=35×(100-2)
=35×100-35×2
=3500-70
=3430
(4)102×45
=(100+2)×45
=100×45+2×45
=4500+90
=4590
(5)23×134-34×23
=23×(134-34)
=23×100
=2300
(6)648+203
=648+2+201
=650+201
=851
(7)98×32
=(100-2)×32
=100×32-2×32
=3200-64
=3136
(8)41×99
=41×(100-1)
=41×100-41×1
=4100-41
=4059