题目内容

口算:
3.14×2=3.14×3=3.14×4=3.14×5=3.14×6=
3.14×7=3.14×8=3.14×9=3.14×2.7=
1
3
+
1
5
=
4+
3
5
=
2-
5
6
=
2
7
×
7
8
=
2
7
=
5
8
÷5=
5
6
×
2
5
=
1
2
-
1
6
=
3.14×2+3.14×0.7=______+______=______.
3.14×2=6.28; 3.14×3=9.42; 3.14×4=12.56; 3.14×5=15.7; 3.14×6=18.84;
3.14×7=21.98; 3.14×8=25.12; 3.14×9=28.26; 3.14×2.7=8.478;
1
3
+
1
5
=
8
15

4+
3
5
=4
3
5
; 2-
5
6
=1
1
6
2
7
×
7
8
=
1
4
; 6÷
2
7
=21;
5
8
÷5=
1
8

5
6
×
2
5
=
1
3
1
2
-
1
6
=
1
3
; 3.14×2+3.14×0.7=6.28+2.198=8.478.
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