题目内容
能简算的要简算
| (
|
| ||||||||||||||||||
| 121×
| 119×
|
(1)
×
+
×
=(
+
)×
=1×
=
;
(2)(
-
)×
=
×
-
×
=1-
=
;
(3)
×99+
=
×(99+1)
=
×100
=225;
(4)
×
-
×
=
×(
-
)
=
×1
=
;
(5)121×
=(120+1)×
=120×
+1×
=7+
=7
;
(6)119×
=(120-1)×
=120×
-
=7-
=6
.
| 4 |
| 7 |
| 5 |
| 12 |
| 5 |
| 12 |
| 3 |
| 7 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 12 |
=1×
| 5 |
| 12 |
=
| 5 |
| 12 |
(2)(
| 2 |
| 3 |
| 4 |
| 9 |
| 3 |
| 2 |
=
| 2 |
| 3 |
| 3 |
| 2 |
| 4 |
| 9 |
| 3 |
| 2 |
=1-
| 2 |
| 3 |
=
| 1 |
| 3 |
(3)
| 9 |
| 4 |
| 9 |
| 4 |
=
| 9 |
| 4 |
=
| 9 |
| 4 |
=225;
(4)
| 2 |
| 5 |
| 17 |
| 16 |
| 1 |
| 16 |
| 2 |
| 5 |
=
| 2 |
| 5 |
| 17 |
| 16 |
| 1 |
| 16 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
(5)121×
| 7 |
| 120 |
=(120+1)×
| 7 |
| 120 |
=120×
| 7 |
| 120 |
| 7 |
| 120 |
=7+
| 7 |
| 120 |
=7
| 7 |
| 120 |
(6)119×
| 7 |
| 120 |
=(120-1)×
| 7 |
| 120 |
=120×
| 7 |
| 120 |
| 7 |
| 120 |
=7-
| 7 |
| 120 |
=6
| 113 |
| 120 |
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