Question

(－2.78）＋（－4.05）＋（＋6.17）＋（－5.43）＋2.14 ＝

需要正确解题格式，详细解题方式与过程，最好指导方法。

Answer 1

(－2.78）＋（－4.05）＋（＋6.17）＋（－5.43）＋2.14
解：原式=6.17+2.14-2.78-4.05-5.43
=-3.95
正正得正
负负得正
正负得负
负正得负

Answer 2

(－2.78）＋（－4.05）＋（＋6.17）＋（－5.43）＋2.14
=-2.78-4.05+6.17-5.43+2.14
=-(2.78+4.05+5.43)+(6.17+2.14)
=-12.26+8.31
=-3.95

Answer 3

(－2.78）＋（－4.05）＋（＋6.17）＋（－5.43）＋2.14
=-2.78-4.05+6.17-5.43+2.14
=8.95+2.14-9.48
=11.09-9.48
=1.61

Answer 4

2.14+6.17-2.78-4.05-5.43=-3.95

Answer 5

0