摘要:19.计算下列各式: (1) (2) (3) (4) (5) (6) (7)
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计算下列各式:
(1)1-
= ;
(2)(1-
)(1-
)= ;
(3)(1-
)(1-
)(1-
)= ;
你能根据所学知识找到计算上面的算式的简便方法吗?请你利用你找到的简便方法计算下式:(1-
)(1-
)(1-
)…(1-
)(1-
)…(1-
).
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(1)1-
| 1 |
| 22 |
(2)(1-
| 1 |
| 22 |
| 1 |
| 32 |
(3)(1-
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
你能根据所学知识找到计算上面的算式的简便方法吗?请你利用你找到的简便方法计算下式:(1-
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 92 |
| 1 |
| 102 |
| 1 |
| n2 |
计算下列各式:
(1)5
-9
+
;
(2)(16
-5
)+(
-
;
(3)5
(3
+4
);
(4)
•
÷
;
(5)(7
-2
)(-7
-2
);
(6)(7
-3
+24)÷
;
(7)
+
-
(a>0).
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(1)5
| 12 |
|
| 1 |
| 2 |
| 48 |
(2)(16
|
|
| 1 |
| 4 |
| 8 |
|
(3)5
| 6 |
| 12 |
| 18 |
(4)
| 15 |
1
|
| 24 |
(5)(7
| 2 |
| 6 |
| 2 |
| 6 |
(6)(7
| 54 |
| 24 |
| 3 |
(7)
| 4a-4b |
| (a-b)3 |
| a3-a2b |