Question

0.3*0.07+0.6*0.62+0.15*0.31=0.3

Answer 1

问：0.3*0.07+0.6*0.62+0.15*0.31=0.3

答：亲，您这道题具体要问什么呢？要验算吗？

答：0.3*0.07+0.6*0.62+0.15*0.31=0.021+0.372+0.0465=0.4395

答：亲，您题目里等于3是错误的

答：亲，您题目里等于0.3是错误的

答：0.3*0.07+0.6*0.62+0.15*0.31=0.3×0.07+0.3×2×0.62+0.3×0.5×0.31=0.3×0.07+0.3×（2×0.62）+0.3×（0.5×0.31）=0.3×0.07+0.3×1.24+0.3×0.155=0.3×（0.07+1.24.0.155）=0.3×1.465=0.4395

答：亲，我觉得您好像是想用简便计算的，上面为你提供了简便计算方法。