脱式计算.(能简算的要用简便方法计算)5.85-1.75-0.25 5.85+1.89+2.1524.8+4.6+5.4 15.68-(7.68+2.89)
问题描述:
脱式计算.(能简算的要用简便方法计算)
5.85-1.75-0.25
5.85+1.89+2.15
24.8+4.6+5.4
15.68-(7.68+2.89)
答
(1)5.85-1.75-0.25
=5.85-(1.75+0.25)
=5.85-2
=3.85;
(2)5.85+1.89+2.15
=5.85+2.15+1.89
=8+1.89
=9.89;
(3)24.8+4.6+5.4
=24.8+(4.6+5.4)
=24.8+10
=34.8;
(4)15.68-(7.68+2.89)
=15.68-7.68-2.89
=8-2.89
=5.11.