4.2×[2.46÷(7.58-7.56)]用简便方法怎么计算?_数学解答

4.2×[2.46÷(7.58-7.56)]用简便方法怎么计算?

人气：305 ℃　时间：2019-10-19 13:02:24

解答

4.2×[2.46÷(7.58-7.56)]
=4.2×(2.46÷0.02)
=4.2×123
=(4+0.2)×123
=4×123+0.2×123
=492+24.6
=516.6