四十九乘二分之二十一等于多少?
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49×2分之21
=(50-1)×21/2
=50×21/2-21/2
=25×(20+1)-20/2-1/2
=25×20+25×1-10-1/2
=500+25-10-1/2
=515-1/2
=514又2分之1
=(50-1)×21/2
=50×21/2-21/2
=25×(20+1)-20/2-1/2
=25×20+25×1-10-1/2
=500+25-10-1/2
=515-1/2
=514又2分之1
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