第1个回答 2016-04-24
(2.524+1.389)-(0.524+1.389)
=2.524+1.389-0.524-1.389
=(2.524-0.524)+(1.389=1.389)
=2+0
=2
23.2+23.9+23.7+23.5+23.6+23.3
=23.2+(23.9+23.5+23.6)+(23.7+23.3)
=23.2+71+47
=141.2
1.996+19.97+199.8
=2-0.004+20-0.03+200-0.2
=2+20+200-(0.004+0.03+0.2)
=222-0.324
=221.676本回答被网友采纳