1.58*0.58+0.42*0.42+1.16*0.42怎样简算 1.58*0.58+0.42*0.42+1.16*0.42怎样简算
问题描述：
1.58*0.58+0.42*0.42+1.16*0.42怎样简算 1.58*0.58+0.42*0.42+1.16*0.42怎样简算
答
1.58*0.58+0.42*0.42+1.16*0.42
=1.58*0.58+0.42*（0.42+1.16）
=1.58*0.58+0.42*1.58
=1.58*（0.58+0.42）
=1.58*1
=1.58