数学 用简便方法计算
来源:百度知道 编辑:UC知道 时间:2024/05/15 11:10:56
就一题!!
2又1/10X49又1/5-48又1/5X2又1/10-2又1/10
用简便方法算
2又1/10X49又1/5-48又1/5X2又1/10-2又1/10
用简便方法算
2又1/10×49又1/5-48又1/5×2又1/10-2又1/10
=2又1/10×(49又1/5-48又1/5-1)
=2又1/10×0
=0
提取2又1/10
剩下的相减等于0
提公因数
21/10*(245/5-240/5-1)
=21/10*(1-1)
=21/10*0
=0
21/10*246/5-241/5*21/10-21/10
=21/10(246/5-241/5-1)
=21/10(1-1)
=0
2又1/10X49又1/5-48又1/5X2又1/10-2又1/10
=2又1/10(49又1/5-48又1/5-1)
=0