31.4ⅹ3.15+3.14ⅹ68.5
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31.4ⅹ3.15+3.14ⅹ68.5
=(3.14ⅹ10)ⅹ3.15+3.14ⅹ68.5
=3.14ⅹ(10ⅹ3.15)+3.14ⅹ68.5
=3.14ⅹ31.5+3.14ⅹ68.5
=3.14ⅹ(31.5+68.5)
=3.14ⅹ100
=314
=(3.14ⅹ10)ⅹ3.15+3.14ⅹ68.5
=3.14ⅹ(10ⅹ3.15)+3.14ⅹ68.5
=3.14ⅹ31.5+3.14ⅹ68.5
=3.14ⅹ(31.5+68.5)
=3.14ⅹ100
=314
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