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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