题目内容
(2009?镇江)用递等式计算:
3684÷12+43
6.5×(2.4-1.6)-1.2
×
+
×
2-(
+
)÷
÷[
-(1-
)].
3684÷12+43
6.5×(2.4-1.6)-1.2
5 |
12 |
1 |
5 |
4 |
5 |
5 |
12 |
2-(
1 |
6 |
2 |
3 |
5 |
9 |
2 |
15 |
2 |
5 |
7 |
10 |
分析:(1)(2)(4)(5)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;
(3)利用乘法分配律解决即可.
(3)利用乘法分配律解决即可.
解答:解:(1)3684÷12+43
=307+43,
=350;
(2)6.5×(2.4-1.6)-1.2
=6.5×0.8-1.2,
=5.2-1.2,
=4;
(3)
×
+
×
=(
+
)×
,
=1×
,
=
;
(4)2-(
+
)÷
=2-
×
,
=2-1
,
=
;
(5)
÷[
-(1-
)].
=
÷[
-
],
=
÷
,
=
.
=307+43,
=350;
(2)6.5×(2.4-1.6)-1.2
=6.5×0.8-1.2,
=5.2-1.2,
=4;
(3)
5 |
12 |
1 |
5 |
4 |
5 |
5 |
12 |
=(
1 |
5 |
4 |
5 |
5 |
12 |
=1×
5 |
12 |
=
5 |
12 |
(4)2-(
1 |
6 |
2 |
3 |
5 |
9 |
=2-
5 |
6 |
9 |
5 |
=2-1
1 |
2 |
=
1 |
2 |
(5)
2 |
15 |
2 |
5 |
7 |
10 |
=
2 |
15 |
2 |
5 |
3 |
10 |
=
2 |
15 |
1 |
10 |
=
4 |
3 |
点评:在利用递等式计算时,要注意计算过程的完整性,中间不要有太大跳跃.
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