题目内容
计算.
(1)
÷[
×(
-
)]
(2)
÷7+
×
(3)(3.8-1.8÷2)×50%
(4)
+
×
+
.
(1)
9 |
10 |
1 |
2 |
6 |
5 |
3 |
10 |
(2)
8 |
13 |
1 |
7 |
5 |
13 |
(3)(3.8-1.8÷2)×50%
(4)
2 |
3 |
1 |
3 |
9 |
14 |
11 |
14 |
(1)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=
×
,
=2;
(2)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)(3.8-1.8÷2)×50%,
=(3.8-0.9)×0.5,
=2.9×0.5,
=1.45;
(4)
+
×
+
,
=
+(
+
),
=
+1,
=1
.
9 |
10 |
1 |
2 |
6 |
5 |
3 |
10 |
=
9 |
10 |
1 |
2 |
9 |
10 |
=
9 |
10 |
9 |
20 |
=
9 |
10 |
20 |
9 |
=2;
(2)
8 |
13 |
1 |
7 |
5 |
13 |
=
8 |
13 |
1 |
7 |
1 |
7 |
5 |
13 |
=(
8 |
13 |
5 |
13 |
1 |
7 |
=1×
1 |
7 |
=
1 |
7 |
(3)(3.8-1.8÷2)×50%,
=(3.8-0.9)×0.5,
=2.9×0.5,
=1.45;
(4)
2 |
3 |
1 |
3 |
9 |
14 |
11 |
14 |
=
2 |
3 |
3 |
14 |
11 |
14 |
=
2 |
3 |
=1
2 |
3 |
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