题目内容
脱式计算:
306×15-2080
-
÷
+
3.5×(20.6-16.8÷4.8)
(
+
×
)÷
×[7-4÷(
+
)].
306×15-2080
9 |
10 |
1 |
3 |
1 |
2 |
5 |
6 |
3.5×(20.6-16.8÷4.8)
(
7 |
9 |
2 |
3 |
5 |
6 |
4 |
15 |
4 |
5 |
2 |
15 |
2 |
3 |
分析:本题据四则混合运算法则计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)306×15-2080
=4590-2080,
=2510;
(2)
-
÷
+
=
-
+
,
=
;
(3)3.5×(20.6-16.8÷4.8)
=3.5×(20.6-3.5),
=3.5×17.1,
=59.85;
(4)(
+
×
)÷
=(
+
)÷
,
=
×
,
=5;
(5)
×[7-4÷(
+
)]
=
×[7-4×
],
=
×[7-5],
=
×2,
=
.
=4590-2080,
=2510;
(2)
9 |
10 |
1 |
3 |
2 |
3 |
5 |
6 |
=
9 |
10 |
1 |
2 |
5 |
6 |
=
37 |
30 |
(3)3.5×(20.6-16.8÷4.8)
=3.5×(20.6-3.5),
=3.5×17.1,
=59.85;
(4)(
7 |
9 |
2 |
3 |
5 |
6 |
4 |
15 |
=(
7 |
9 |
5 |
9 |
4 |
15 |
=
4 |
3 |
15 |
4 |
=5;
(5)
4 |
5 |
2 |
15 |
2 |
3 |
=
4 |
5 |
15 |
12 |
=
4 |
5 |
=
4 |
5 |
=
8 |
5 |
点评:完成此类脱式计算要据计算法则细心逐步算出结果.
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