4.9乘0.45加0.49乘4.2加0.049乘13 简便运算哦!
问题描述:
4.9乘0.45加0.49乘4.2加0.049乘13 简便运算哦!
答
4.9*0.45+0.49*4.2+0.049*13
=4.9*0.45+4.9*0.42+4.9*0.13
=4.9*(0.45+0.42+0.13)
=4.9x1
=4.9