题目内容
计算题
(1)(7.6-3.6÷2)×1.5
(2)
+2
+
+3
(3)
-
÷
(4)
+(
-
)÷
.
(1)(7.6-3.6÷2)×1.5
(2)
3 |
4 |
9 |
17 |
1 |
4 |
8 |
17 |
(3)
4 |
5 |
1 |
3 |
7 |
15 |
(4)
2 |
3 |
5 |
6 |
3 |
4 |
3 |
8 |
分析:(1)先算小括号里面的除法,再算小括号里面的减法,最后算括号外的乘法;
(2)运用加法结合律简算;
(3)先算除法,再算减法;
(4)先算小括号里面的减法,再算括号外的除法,最后算加法.
(2)运用加法结合律简算;
(3)先算除法,再算减法;
(4)先算小括号里面的减法,再算括号外的除法,最后算加法.
解答:解:(1)(7.6-3.6÷2)×1.5,
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(2)
+2
+
+3
,
=(
+
)+(3
+2
),
=1+6,
=7;
(3)
-
÷
,
=
-
,
=
;
(4)
+(
-
)÷
,
=
+
÷
,
=
+
,
=
.
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(2)
3 |
4 |
9 |
17 |
1 |
4 |
8 |
17 |
=(
3 |
4 |
1 |
4 |
8 |
17 |
9 |
17 |
=1+6,
=7;
(3)
4 |
5 |
1 |
3 |
7 |
15 |
=
4 |
5 |
5 |
7 |
=
3 |
35 |
(4)
2 |
3 |
5 |
6 |
3 |
4 |
3 |
8 |
=
2 |
3 |
1 |
12 |
3 |
8 |
=
2 |
3 |
2 |
9 |
=
8 |
9 |
点评:考查四则混合运算的顺序:1、如果是同一级运算,一般按从左往右依次进行计算;2、如果既有加减、又有乘除法,先算乘除法、再算加减;3、如果有括号,先算括号里面的;4、如果符合运算定律,可以利用运算定律进行简算.
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