题目内容
(2007?滨湖区)用递等式计算,能简算的要简算
14×75-624÷39
(7.6-3.6÷2)×1.5
-
÷
÷9+
×
+(
-
)÷
÷[
-(1-
)].
14×75-624÷39
(7.6-3.6÷2)×1.5
4 |
5 |
1 |
3 |
7 |
15 |
5 |
7 |
4 |
7 |
1 |
9 |
2 |
3 |
5 |
6 |
3 |
4 |
3 |
8 |
7 |
11 |
2 |
5 |
7 |
10 |
分析:算式(4)可据乘法分配律进行简便计算;
其余算式根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
其余算式根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)14×75-624÷39
=150×7-208÷13,
=1050-16,
=1034;
(2)(7.6-3.6÷2)×1.5
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(3)
-
÷
=
-
×
,
=
-
,
=
;
(4)
÷9+
×
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(5)
+(
-
)÷
=
+
×
,
=
+
,
=
;
(6)
÷[
-(1-
)]
=
÷[
-
],
=
÷
,
=
×10,
=
.
=150×7-208÷13,
=1050-16,
=1034;
(2)(7.6-3.6÷2)×1.5
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(3)
4 |
5 |
1 |
3 |
7 |
15 |
=
4 |
5 |
1 |
3 |
15 |
7 |
=
4 |
5 |
5 |
7 |
=
3 |
35 |
(4)
5 |
7 |
4 |
7 |
1 |
9 |
=
5 |
7 |
1 |
9 |
4 |
7 |
1 |
9 |
=(
5 |
7 |
4 |
7 |
1 |
9 |
=
9 |
7 |
1 |
9 |
=
1 |
7 |
(5)
2 |
3 |
5 |
6 |
3 |
4 |
3 |
8 |
=
2 |
3 |
1 |
12 |
8 |
3 |
=
2 |
3 |
2 |
9 |
=
8 |
9 |
(6)
7 |
11 |
2 |
5 |
7 |
10 |
=
7 |
11 |
2 |
5 |
3 |
10 |
=
7 |
11 |
1 |
10 |
=
7 |
11 |
=
70 |
11 |
点评:完成有关于分数的四则混合运算时要细心,注意通分约分,结果化为最简分数.
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