计算:①-12+(-13)=______;②-12+13=______;③12+13=______;④12-13=______;⑤-13-14=______;⑥-14-(-15)=______.-数学

题目简介

计算:①-12+(-13)=______;②-12+13=______;③12+13=______;④12-13=______;⑤-13-14=______;⑥-14-(-15)=______.-数学

题目详情

计算:
①-
1
2
+(-
1
3
)=______;
②-
1
2
+
1
3
=______;
1
2
+
1
3
=______;
1
2
-
1
3
=______;
⑤-
1
3
-
1
4
=______;
⑥-
1
4
-(-
1
5
)=______.
题型:填空题难度:中档来源:不详

答案

①-class="stub"1
2
+(-class="stub"1
3
)=-(class="stub"1
2
+class="stub"1
3

=-class="stub"5
6


②-class="stub"1
2
+class="stub"1
3
=-(class="stub"1
2
-class="stub"1
3

=-class="stub"1
6


class="stub"1
2
+class="stub"1
3
=class="stub"5
6


class="stub"1
2
-class="stub"1
3
=class="stub"1
2
+(-class="stub"1
3

=class="stub"1
6


⑤-class="stub"1
3
-class="stub"1
4
=-(class="stub"1
3
+class="stub"1
4

=-class="stub"7
12


⑥-class="stub"1
4
-(-class="stub"1
5
)=-class="stub"1
4
+class="stub"1
5

=-(class="stub"1
4
-class="stub"1
5

=-class="stub"1
20

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