脱式计算,能简便的要简便运算2/15-1/12+2/5 = =
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脱式计算,能简便的要简便运算2/15-1/12+2/5==脱式计算,能简便的要简便运算2/15-1/12+2/5==脱式计算,能简便的要简便运算2/15-1/12+2/5==2/15-1/12+2/5
脱式计算,能简便的要简便运算2/15-1/12+2/5 = =
脱式计算,能简便的要简便运算
2/15-1/12+2/5
=
=
脱式计算,能简便的要简便运算2/15-1/12+2/5 = =
2/15-1/12+2/5
=8/60-5/60+24/60
=27/60
=9/20
2/15-1/12+2/5
= 8/60-5/60+24/60
=27/60
=9/20