30-(15.6-7.52+6.38)和15.75+0.65-2.75+3.35

问题描述:

30-(15.6-7.52+6.38)和15.75+0.65-2.75+3.35
如何简算?

30-(15.6-7.52+6.38) 15.75+0.65-2.75+3.35
=(30+7.52)-(15.6+6.38) =15.75-2.75+(0.65+3.35)
=37.52-21.98 =13+10
=15.54 =23