把下面的算式补充完整.
18.7﹣16.4+
=18.7+ ﹣l6.4
=20﹣16.4
=
35.67+ +21.35
=35.67+( +21.35)
=35.67+50
=
54.37﹣ ﹣9.23
=54.37﹣( +9.23)
=54.37﹣10
=
33.25+6.23﹣
=33.25﹣ +6.23
=30+6.23
= .
口算.
10﹣4.2= 7.1﹣3.9= 4.3﹣4= 3.8+1.4=
5.7+1.8= 2.7﹣1.7= 0.5+8.5= 3.6﹣0.9=
算一算,小明家两个月的水费和污水处理费一共是多少钱?(单位:元)
|
水费 |
污水处理费 |
合计 |
9月份 |
57.90 |
17.80 |
|
10月份 |
60.40 |
19.00 |
|
总计 |
|
|
|
试题篮
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