题目内容

算一算
2
5
+
1
5
=______
3
4
-
1
4
=______
1-
5
7
=______
3
10
+
3
10
+
3
10
=______
5
5
-
2
5
-
1
5
=______
260+402=______185+415=______529-329=______800-346=______402-72=______
33×3=______15×4=______12×7=______208×5=______300×6=______.
(1)
2
5
+
1
5
=
3
5
(2)
3
4
-
1
4
=
1
2
(3)1-
5
7
=
2
7
(4)
3
10
+
3
10
+
3
10
=
9
10
(5)
5
5
-
2
5
-
1
5
=
2
5
(6)260+402=662(7)185+415=600(8)529-329=200(9)800-346=454(10)402-72=330
(11)33×3=99(12)15×4=60(13)12×7=84(14)208×5=1040(15)300×6=1800
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