(1/4-0.1/2)*15/13+1/13/12

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(1/4-0.1/2)*15/13+1/13/12
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(1/4-0.1/2)*15/13+1/13/12
(1/4-0.1/2)*15/13+1/13/12

(1/4-0.1/2)*15/13+1/13/12
(1/4-0.1/2)*15/13+1/13/12 颠倒相乘
=[﹙1/4-0.1/2﹚×15 ]×1/13 + 1/13 × 1/12 打开括号
= ﹙0.8 /4 ×15 ﹚×1/13 + 1/156 去括号
=3/13 + 1/156 通分
=36/156 + 1/156 合并
=37/156
= 0.237179487

这是繁分数吧
(1/4-0.1/2)*15/13+1/13/12
=(1/4-1/20)*15*12/(13*12)+1/(13*12) (先通分)
=(45-9)/(13*12)+1/(13*12)
=37/156

0.23717948717948717948717948717949