19.8/（2.44+4.16）*2.1怎么简算
问题描述：
19.8/（2.44+4.16）*2.1怎么简算
答
=9.9*2/6.6*2.1=3*2.1=6.3
答
=19.8/6.6*2.1
=3*2.1
=6.3
答
先加再除后乘。。
答
=19.8/6.6*2.1
=3*2.1
=6.3
答
19.8*2.1/(2.44+4.16)
=19.8*2.1/6.6
=1.1*18*2.1/(6*1.1)
=18*2.1/6
=3*2.1
=6.3
答
按着步骤做就是简便算法