计算下面各题,怎样简便就怎样算?

125×64 490×99 6400÷8÷4
2024-11-22 11:07:57
推荐回答(5个)
回答1:

125×64=25×5×8×8=200×40=8000490×99=490×(100-1)=49000-490
=49000-500+10=48510
6400÷8÷4=800÷4=200

回答2:

125×64 = 125x8x8= 1000x8=8000
490x99=490x100-490= 4900-490= 4410
6400÷8÷4= 800÷4 = 200

回答3:

125×64
=(100+25)×(60+4)
=100×60+100×4+25×60+25×4
=6000+400+1500+100

=7500+500
=8000

回答4:

125×64=125×8×8=8000
490×99=490×100-490=48510
6400÷8÷4=800÷4=200

回答5:

125×64=125×8×8=8000