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)

(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....