Question

有理数的加减法 2题计算题.仲有2题比较大小.

Answer 1

1.2.56+(-4.3)+(-38.56)+4.3

=-1.74-38.56+4.3

=-40.3+4.3

=-36

2.-20+(-14)-(-18)-13

=-34+18-13

=-29

-2.1比1小；-3.2比-4.3大.