简便计算:
3又1/4*6.23-6.23-0.25
=6.23*(3.25-1)-0.25
=6.23*2.25-0.25
=6.23*9/4-0.25
=14.0175-0.25
=13.7675
设x天可以看完,则:
15:12=x:24 (书的页数一定,看的页数与天数成反比
x=24*15/12=30 天
即30天可以看完 .
简便计算:
3又1/4*6.23-6.23-0.25
=6.23*(3.25-1)-0.25
=6.23*2.25-0.25
=6.23*9/4-0.25
=14.0175-0.25
=13.7675
设x天可以看完,则:
15:12=x:24 (书的页数一定,看的页数与天数成反比
x=24*15/12=30 天
即30天可以看完 .