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用你喜欢的方法计算.①35+710+25②78−(38+25)③2−1519−419④611+1115+511−615.
题目详情
用你喜欢的方法计算.
①
+
+
②
−(
+
)
③2−
−
④
+
+
−
.
①
| 3 |
| 5 |
| 7 |
| 10 |
| 2 |
| 5 |
②
| 7 |
| 8 |
| 3 |
| 8 |
| 2 |
| 5 |
③2−
| 15 |
| 19 |
| 4 |
| 19 |
④
| 6 |
| 11 |
| 11 |
| 15 |
| 5 |
| 11 |
| 6 |
| 15 |
▼优质解答
答案和解析
①
+
+
,
=(
+
)+
,
=1+
,
=1
;
②
−(
+
),
=
-
-
,
=
−
,
=
;
③2−
−
,
=2-(
+
),
=2-1,
=1;
④
+
+
−
,
=(
+
)+(
-
),
=1+
=1
.
| 3 |
| 5 |
| 7 |
| 10 |
| 2 |
| 5 |
=(
| 3 |
| 5 |
| 2 |
| 5 |
| 7 |
| 10 |
=1+
| 7 |
| 10 |
=1
| 7 |
| 10 |
②
| 7 |
| 8 |
| 3 |
| 8 |
| 2 |
| 5 |
=
| 7 |
| 8 |
| 3 |
| 8 |
| 2 |
| 5 |
=
| 1 |
| 2 |
| 2 |
| 5 |
=
| 1 |
| 10 |
③2−
| 15 |
| 19 |
| 4 |
| 19 |
=2-(
| 15 |
| 19 |
| 4 |
| 19 |
=2-1,
=1;
④
| 6 |
| 11 |
| 11 |
| 15 |
| 5 |
| 11 |
| 6 |
| 15 |
=(
| 6 |
| 11 |
| 5 |
| 11 |
| 11 |
| 15 |
| 6 |
| 15 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
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