巧算 22.01+20.03+20.05+20.07+20.09+20.11+20.13
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巧算 22.01+20.03+20.05+20.07+20.09+20.11+20.13
22.01+20.03+20.05+20.07+20.09+20.11+20.13
22.01+20.03+20.05+20.07+20.09+20.11+20.13
法1:
基准数法:
22.01+20.03+20.05+20.07+20.09+20.11+20.13
=20×7+(0.01+0.03+0.05+0.07+0.09+0.11+0.13)+2
=140+(0.11+0.09)+(0.07+0.13)+(0.05+0.03+0.01)+2
=140+0.4+0.09+2
=142.49
法2:
等差数列:
22.01+20.03+20.05+20.07+20.09+20.11+20.13
=22.01+(20.03+20.05+20.07+20.09+20.11+20.13 )
=22.01+(20.03+20.13)×6÷2
=22.01+40.16×3
=22.01+120.48
=142.49
基准数法:
22.01+20.03+20.05+20.07+20.09+20.11+20.13
=20×7+(0.01+0.03+0.05+0.07+0.09+0.11+0.13)+2
=140+(0.11+0.09)+(0.07+0.13)+(0.05+0.03+0.01)+2
=140+0.4+0.09+2
=142.49
法2:
等差数列:
22.01+20.03+20.05+20.07+20.09+20.11+20.13
=22.01+(20.03+20.05+20.07+20.09+20.11+20.13 )
=22.01+(20.03+20.13)×6÷2
=22.01+40.16×3
=22.01+120.48
=142.49
(20.01+20.02+20.03+20.04+20.05+20.06+20.07+20.08+20.09)÷9
200.3+20.05-20.03×200.
200.03*20.05-20.03*200.4么简算
20.07*1994-19.93*2007 巧算!
用氧化还原滴定FeSO4 .7H2O 中铁的质量分数为20.01% 、20.03% 、20.04%、 20.05%.计算
2013.12.22.01
巧算(巧算)
2007+200.7+20.07+2.007=?
简便计算:8.02*15-20.13
200.3+20.03+2.003+0.2003=
用简便方法计算,20.11*5²+20.11*99-20.11*24
20.11 乘52+20.11乘74-20.11乘26等于几(过程)