题目内容
写出运算过程.
①3.26-2.9+4.02
②
+
÷
③[
+(
-
)]×
.
①3.26-2.9+4.02
②
3 |
11 |
5 |
12 |
55 |
6 |
③[
5 |
6 |
3 |
4 |
5 |
12 |
6 |
25 |
分析:①按顺序计算;
②先算除,后算减;
③先算小括号里的减,再算中括号里的加,再算乘.
②先算除,后算减;
③先算小括号里的减,再算中括号里的加,再算乘.
解答:解:①3.26-2.9+4.02,
=0.36+4.02,
=4.38;
②
+
÷
,
=
+
×
,
=
+
,
=
;
③[
+(
-
)]×
,
=[
+
]×
,
=
×
,
=
.
=0.36+4.02,
=4.38;
②
3 |
11 |
5 |
12 |
55 |
6 |
=
3 |
11 |
5 |
12 |
6 |
55 |
=
3 |
11 |
1 |
22 |
=
7 |
22 |
③[
5 |
6 |
3 |
4 |
5 |
12 |
6 |
25 |
=[
5 |
6 |
1 |
3 |
6 |
25 |
=
7 |
6 |
6 |
25 |
=
7 |
25 |
点评:考查四则混合运算.注意运算顺序和运算法则.
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