题目内容
脱式计算,能简算的要简算. (
|
| ||||||||||||||
| (
|
(1)(
+
-
)×24
=
×24+
×24-
×24
=8+2-4
=6;
(2)
×
+
÷
=
×
+
×
=
×(
+
)
=
;
(3)
×
+
×
=(
+
)×
=1×
=
;
(4)(
+
)×
=
×
+
×
=
+
=
.
1 |
3 |
1 |
12 |
1 |
6 |
=
1 |
3 |
1 |
12 |
1 |
6 |
=8+2-4
=6;
(2)
4 |
5 |
2 |
3 |
1 |
5 |
3 |
4 |
=
4 |
5 |
2 |
3 |
1 |
5 |
4 |
3 |
=
4 |
5 |
2 |
3 |
1 |
3 |
=
4 |
5 |
(3)
2 |
7 |
8 |
9 |
5 |
7 |
8 |
9 |
=(
2 |
7 |
5 |
7 |
8 |
9 |
=1×
8 |
9 |
=
8 |
9 |
(4)(
5 |
7 |
5 |
8 |
2 |
5 |
=
5 |
7 |
2 |
5 |
5 |
8 |
2 |
5 |
=
2 |
7 |
1 |
4 |
=
15 |
28 |
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