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算一算25+15=353534-14=12121-57=2727310+310+310=91091055-25-15=2525260+402=185+415=529-329=800-346=402-72=33×3=15×4=12×7=208×5=300×6=.

题目详情
算一算
2
5
+
1
5
=
3
5
3
5
3
4
-
1
4
=
1
2
1
2
1-
5
7
=
2
7
2
7
3
10
+
3
10
+
3
10
=
9
10
9
10
5
5
-
2
5
-
1
5
=
2
5
2
5
260+402=______ 185+415=______ 529-329=______ 800-346=______ 402-72=______
33×3=______ 15×4=______ 12×7=______ 208×5=______ 300×6=______.
▼优质解答
答案和解析
(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