4.04
0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89=?
1个回答
相关问题
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计算：（1）0.••01+0.••12+0.••23+0.••34+…+0.••78+0.••89；（2）0.0•1+0
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0.12+0.23+0.34.+0.89=
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(1+0.23+0.34)x(0.23+0.34+0.78)-(1+0.23+0.34+0.78)x(0.23+0.34
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(1十0.23十0.45)x(0.45十o.67十0.89)一(1十0.45十0.67十0.89
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（1+0.23+0.34）×（0.23+0.34+0.56）-（1+0.23+0.34+0.56）×（0.23+0.34
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﹙1+0.23+0.34﹚×﹙0.23+0.34+0.56)-﹙1+0.23+0.34+0.56﹚×﹙0.23+0.34
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简便运算;0.12+0.23+0.34+……+0.89=
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(1+0.23+0.34)*(0.23+0.34+0.45)-(1+0.23+0.34+0.45)*(0.23+0.34
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（1+0.23+0.34）×（0.23+0.34+0.45）-（1+0.23+0.34+0.45）×（0.23+0.34
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用特殊方法算(1+0.45+0.56)*(0.45+0.56+0.67)-(1+0.45+0.56+0.67*(0.45