求同步解析与测评数学五年级上册第8页最后一题答案!用简便方法计算下面各题.2.5*3.8*0.4*0.22.7*10.26.5*1.9-6.5*0.99.8*25

Question

求同步解析与测评数学五年级上册第8页最后一题答案!
用简便方法计算下面各题.
2.5*3.8*0.4*0.2
2.7*10.2
6.5*1.9-6.5*0.9
9.8*25

Answer 1

(2.5*0.4)*(3.8*0.2)
2.7*10+2.7*0.2
6.5*(1.9-0.9)
9.8*100/4