128×126/127怎么简便运算?
128×126/127怎么简便运算?
日期:2021-06-24 08:02:00 人气:1
=(127+1)*(127-1)/127
=(127^2-1^2)/127
=127^2/127-1^2/127
=127-1/127
=126又127分之126
=(127^2-1^2)/127
=127^2/127-1^2/127
=127-1/127
=126又127分之126
128×126/127怎么简便运算?