7分之3*(5分之4-3分之2)/15分之3用简便法算等于多少
2014-01-16
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3/7 * (4/5 - 2/3) / 3/15
= 3/7 * (4/5 - 2/3) * 5
= 3/7 * 4/5 * 5 - 3/7 * 2/3 * 5
= 12/7 - 10/7
= 2/7
= 3/7 * (4/5 - 2/3) * 5
= 3/7 * 4/5 * 5 - 3/7 * 2/3 * 5
= 12/7 - 10/7
= 2/7
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