4.8-4.8*0.5等于几 28.43-(21.43+5.4)等于几 19.6+19.6*99等于几
问题描述:
4.8-4.8*0.5等于几 28.43-(21.43+5.4)等于几 19.6+19.6*99等于几
简便计算
答
4.8-4.8*0.5
=4.8*(1-0.5)
=4.8*0.5
=2.4
28.43-(21.43+5.4)
(21.43+7)-(21.43+5.4)
=7-5.4
=1.6
19.6+19.6*99
=19.6*(1+99)
=19.6*100
=1960