4.56乘9.9+0.456
=4.56*9.9+4.56*0.1
=4.56*(9.9+0.1)
=4.56*10
=45.6还有一道3.75余1.25的和乘2.5加16.5结果是几？速度啊，跪求速度超急的啊！！！！!!!!!!!!(3.75+1.25)*2.5+16.5=12.5+16.5=29