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简便运算.(13+14+15)×606715×2.5-212×4715237+359-337+149+147421415÷7.
题目详情
简便运算.
(
| 6
| ||||||||||||
2
| 42
|
▼优质解答
答案和解析
(1)(
+
+
)×60,
=
×60+
×60+
×60,
=20+15+12,
=47;
(2)6
×2.5-2
×4
,
=(6
-4
)×2
,
=2×2
,
=5;
(3)2
+3
-3
+1
+1
,
=(2+
)+(3+
)-(3+
)+(1+
)+(1+
),
=(2+3-3+1+1)+(
-
+
)+(
+
),
=4+
+1,
=5
;
(4)42
÷7,
=(42+
)×
,
=42×
+
×
,
=6+
=6
.
1 |
3 |
1 |
4 |
1 |
5 |
=
1 |
3 |
1 |
4 |
1 |
5 |
=20+15+12,
=47;
(2)6
7 |
15 |
1 |
2 |
7 |
15 |
=(6
7 |
15 |
7 |
15 |
1 |
2 |
=2×2
1 |
2 |
=5;
(3)2
3 |
7 |
5 |
9 |
3 |
7 |
4 |
9 |
4 |
7 |
=(2+
3 |
7 |
5 |
9 |
3 |
7 |
4 |
9 |
4 |
7 |
=(2+3-3+1+1)+(
3 |
7 |
3 |
7 |
4 |
7 |
5 |
9 |
4 |
9 |
=4+
4 |
7 |
=5
4 |
7 |
(4)42
14 |
15 |
=(42+
14 |
15 |
1 |
7 |
=42×
1 |
7 |
14 |
15 |
1 |
7 |
=6+
2 |
15 |
=6
2 |
15 |
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