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简介:
(1)25×16×5
=25×4×4×5
=(25×4)×(4×5)
=100×20
=2000
(2)52×32+48×32
=(52+48)×32
=100×32
=3200
(3)18×137-×18×37
=18×(137-37)
=18×100
=1800
(4)12×301
=12×(300+1)
=12×300+12×1
=3600+12
=3612
(5)480÷15
=480÷3÷5
=160÷5
=32
(6)21×99
=21×(100-1)
=21×100-21×1
=2100-21
=2079
(7)125×32
=125×8×4
=1000×4
=4000
(8)420÷35
=420÷(7×5)
=420÷7÷5
=60÷5
=12