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

问题描述:

(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