【急】0.869*468+0.657*869-1.25*86.9

问题描述:

【急】0.869*468+0.657*869-1.25*86.9
巧算

0.869*468+0.657*869-1.25*86.9
=0.869*468+657*0.869-125*0.869
=0.869×﹙468+657-125﹚
=869