题目内容

(2009?镇江)用递等式计算:
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
-(1-
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.
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)
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
-(1-
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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