用简便方法计算:0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.60 和7.8569+8.5697+5.6978+6.9785+9.7856这是两个算式

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用简便方法计算:0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.60和7.8569+8.5697+5.6978+6.9785+9.7856这是两个算式用简便

用简便方法计算:0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.60 和7.8569+8.5697+5.6978+6.9785+9.7856这是两个算式
用简便方法计算:0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.60 和
7.8569+8.5697+5.6978+6.9785+9.7856
这是两个算式

用简便方法计算:0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.60 和7.8569+8.5697+5.6978+6.9785+9.7856这是两个算式
7.8569+8.5697+5.6978+6.9785+9.7856 看规律
个位数是 5.6.7.8.9
0.1位 也是5.6.7.8.9
0.01位.
原始=35+35*0.1+35*0.01+35*0.001+35*0.0001
=35*(1+0.1+0.01+0.001+0.0001)
=35*1.1111=38.8885