Question

81.6+85.21-31.21能用简便运算吗？

Answer 1

…你指的简便运算是什么，加减法运算律看一下，先算减法再算加法

Answer 2

81.6+85.21-31.21
=81.6+（85.21-31.21）
=81.6+54
=135.6

Answer 3

81.6＋85.21－31.21
＝81.6＋(85.21－31.21)
＝81.6＋54
＝135.6

Answer 4

81.6+85.21-31.21
=81.6+（85.21-31.21）
=81.6+54
=135.6

Answer 5

81.6+85.21-31.21
=85.21-31.21+81.6
=54+81.6
=135.6