题目内容
(2011?江阴市)递等式计算
43×99+43
3÷
-
×
(27+
)÷9
÷[(
+
)÷
].
43×99+43
3÷
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 10 |
(27+
| 18 |
| 19 |
| 3 |
| 5 |
| 1 |
| 5 |
| 1 |
| 3 |
| 2 |
| 9 |
分析:算式(1)、(3)可据分配律进行简算;算式(2)、(4)据四则混合运算法则计算即可.
解答:解:(1)43×99+43
=43×(99+1),
=42×100,
=4200;
(2)3÷
-
×
=3×2-
,
=6-
,
=5
;
(3)(27+
)÷9
=27÷9+
×
,
=3+
,
=3
;
(4)
÷[(
+
)÷
]
=
÷[
÷
],
=
÷
,
=
.
=43×(99+1),
=42×100,
=4200;
(2)3÷
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 10 |
=3×2-
| 3 |
| 40 |
=6-
| 3 |
| 40 |
=5
| 37 |
| 40 |
(3)(27+
| 19 |
| 19 |
=27÷9+
| 18 |
| 19 |
| 1 |
| 9 |
=3+
| 2 |
| 19 |
=3
| 2 |
| 19 |
(4)
| 3 |
| 5 |
| 1 |
| 5 |
| 1 |
| 3 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 8 |
| 15 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 12 |
| 5 |
=
| 1 |
| 4 |
点评:完成本题要认真分析式中数据,能简算的要简算.
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