问题 解答题
口算:
3.1+15.8+1.9=
100-0.5=7.2÷1.25÷0.8=5.5-5.5÷5=
1.2×0.5=3÷7=
5
9
+
2
9
=
7
8
-
3
8
=
答案

3.1+15.8+1.9=20.8;100-0.5=99.5;7.2÷1.25÷0.8=7.2;5.5-5.5÷5=4.4;
1.2×0.5=0.6;3÷7=
3
7
5
9
+
2
9
=
7
9
7
8
-
3
8
=
1
2
故答案为:20.8;99.5;7.2;4.4;0.6;
3
7
7
9
1
2

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