用简便方法计算下面各题.要用脱式计算.
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/08/13 04:28:57
用简便方法计算下面各题.要用脱式计算.
144又25分之12÷12 (9又7分之2+7又9分之2)÷(7分之5+9分之5)
144又25分之12÷12 (9又7分之2+7又9分之2)÷(7分之5+9分之5)
![用简便方法计算下面各题.要用脱式计算.](/uploads/image/z/7558351-7-1.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98.%E8%A6%81%E7%94%A8%E8%84%B1%E5%BC%8F%E8%AE%A1%E7%AE%97.)
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
=(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