脱式计算。(能简便计算的要简便运算) 396x123 3.96x12.3 568+4

396×123
=(400-4)×123
=49200-492
=48708
3.96×12.3
=(4-0.04)×12.3
=49.2-0.492
=48.708
568+44+32
=(568+32)+44
=600+44
=644
125×768×8
=(125×8)×768
=1000×768
=768000
1.25×76.8×0.8
=(1.25×0.8)×76.8
=1×76.8
=76.8
99×38
=(100-1)×38
=3800-38
=3762
9.9×38
=(10-0.1)×38
=380×3.8
=376.2
357×1200+1200×643
=(357+643)×1200
=1000×1200
=1200000
101×567
=(100+1)×567
=56700+567
=57267
3.57×1200+1200×6.43
=(3.57+6.43)×1200
=10×1200
=12000

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