用简便方法计算下面各题。要用脱式计算。

144又25分之12÷12
=（144+12/25）×1/12
=144×1/12+12/25×1/12
=12+1/25
=12又1/25
（9又7分之2+7又9分之2）÷（7分之5+9分之5）
=（9+2/7+7+2/9）÷（5/7+5/9）
=[16+2×(1/7+1/9)]÷[5×(1/7+1/9)]
=[16+2×16/63]÷[5×16/63]
=16÷(5×16/63) +(2×16/63)÷(5×16/63)
=63/5+2/5
=65/5
=13本回答被提问者和网友采纳

占给位置先
（144又12/25）/12
=（144+12/25）/12
=144/12+12/25/12
=12+1/25
=12又1/25
（9又2/7+7又2/9）/（5/7+5/9）
=（9+2/7+7+2/9）/（5/7+5/9）
=[16+2×(1/7+1/9)]/[5×(1/7+1/9)]
=16/5/(1/7+1/9)+2/5
=16/5X63/16+2/5
=63/5+2/5
=65/5
=13

du