来自卞立平的问题
【下列各题,怎样算简便就怎样算.72.8-8.6+5.8451.69-9.66-1.346.78+2.46+3.2285.07-(15.3-4.8)】
下列各题,怎样算简便就怎样算.
72.8-8.6+5.84 51.69-9.66-1.346.78+2.46+3.22 85.07-(15.3-4.8)
1回答
2020-07-15 17:01
【下列各题,怎样算简便就怎样算.72.8-8.6+5.8451.69-9.66-1.346.78+2.46+3.2285.07-(15.3-4.8)】
下列各题,怎样算简便就怎样算.
72.8-8.6+5.84 51.69-9.66-1.346.78+2.46+3.22 85.07-(15.3-4.8)
(1)72.8-8.6+5.84
=64.2+5.84
=70.04;
(2)51.69-9.66-1.34
=51.69-(9.66+1.34)
=51.69-11
=40.69;
(3)6.78+2.46+3.22
=(6.78+3.22)+2.46
=10+2.46
=12.46;
(4)85.07-(15.3-4.8)
=85.07-10.5
=74.57.