题目内容
怎样简便就怎样算.
| 11-
| ||||||||||
99×
|
| ||||||||||
(2-
|
|
(1)
×
+
=
+
=
;
(2)11-
×
=11-
=10
;
(3)99×
=(100-1)×
=100×
-
=87-
=86
;
(4)
×34+
×16
=
×(34+16)
=
×50
=8;
(5)(2-
)÷
=(2-
)×12
=2×12-
×12
=24-3
=21;
(6)
÷[1÷(
-
)]
=
÷[1÷
]
=
÷10
=
×
=
.
| 7 |
| 12 |
| 6 |
| 7 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 3 |
| 4 |
=
| 5 |
| 4 |
(2)11-
| 5 |
| 17 |
| 4 |
| 5 |
=11-
| 4 |
| 17 |
=10
| 13 |
| 17 |
(3)99×
| 87 |
| 100 |
=(100-1)×
| 87 |
| 100 |
=100×
| 87 |
| 100 |
| 87 |
| 100 |
=87-
| 87 |
| 100 |
=86
| 13 |
| 100 |
(4)
| 4 |
| 25 |
| 4 |
| 25 |
=
| 4 |
| 25 |
=
| 4 |
| 25 |
=8;
(5)(2-
| 1 |
| 4 |
| 1 |
| 12 |
=(2-
| 1 |
| 4 |
=2×12-
| 1 |
| 4 |
=24-3
=21;
(6)
| 5 |
| 4 |
| 1 |
| 5 |
| 1 |
| 10 |
=
| 5 |
| 4 |
| 1 |
| 10 |
=
| 5 |
| 4 |
=
| 5 |
| 4 |
| 1 |
| 10 |
=
| 1 |
| 8 |
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