256-99
=256-(100-1)
=256-100+1
=156+1
=157
这是最详细的。
我只看到一道题是256-99吗
256-99=256-100+1=157
3.35×99×2+6.7
=3.35*(100-1)+6.7
=335-3.35+6.7
=335+3.35
=338.35
十二分之五×十三分之一-四分之一÷13
=5/12*1/13-1/4/13
=5/(12*13)-1/(4*13)
=1/13*(5/12-3/12)
=1/78
3.5×98+35×0.2
=3.5*(98+2)
=350
6÷五分之三-五分之三除6
=6/(3/5)-6/3/5
=0