(0.0777……+0.0232323……)×0.22222……×99/100
1个回答
(0.0777……+0.0232323……)×0.22222……×99/100
=(7/90+23/990)×2/9×99/100
=10/99×11/50
=1/45
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简便计算 101×0.87+0.99×87