题目内容
(2012?浙江)计算
5
+5
-6.2-3
×
+
×
-
×3
5÷[4×(
-
)]×1.2
[3
-(0.2+
)×3.5]÷(6.05+
).
5
2 |
5 |
1 |
2 |
3 |
5 |
7 |
13 |
5 |
8 |
2 |
13 |
7 |
16 |
1 |
13 |
1 |
2 |
5÷[4×(
1 |
16 |
1 |
32 |
[3
1 |
4 |
1 |
3 |
1 |
20 |
分析:(1)(3)(4)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;
(2)根据乘法交换律及分配律计算即可.
(2)根据乘法交换律及分配律计算即可.
解答:解:(1)5
+5
-6.2-3
=5.4+5.5-6.2-3.6,
=1.1;
(2)
×
+
×
-
×3
=
×
+
×
-
×
,
=
×
+
×
-
×
,
=(
+
-
)×
,
=
×
,
=
;
(3)5÷[4×(
-
)]×1.2
=5÷[4×
]×1.2,
=5÷
×1.2,
=40×1.2,
=48;
(4)[3
-(0.2+
)×3.5]÷(6.05+
)
=[
-(
+
)×3.5]÷(6.05+0.05),
=[
-
×
]÷6.1,
=[
-
]÷6.1,
=
÷
,
=
.
2 |
5 |
1 |
2 |
3 |
5 |
=5.4+5.5-6.2-3.6,
=1.1;
(2)
7 |
13 |
5 |
8 |
2 |
13 |
7 |
16 |
1 |
13 |
1 |
2 |
=
7 |
13 |
5 |
8 |
7 |
13 |
2 |
16 |
1 |
13 |
7 |
2 |
=
7 |
13 |
5 |
8 |
7 |
13 |
1 |
8 |
7 |
13 |
4 |
8 |
=(
5 |
8 |
1 |
8 |
4 |
8 |
7 |
13 |
=
1 |
4 |
7 |
13 |
=
7 |
52 |
(3)5÷[4×(
1 |
16 |
1 |
32 |
=5÷[4×
1 |
32 |
=5÷
1 |
8 |
=40×1.2,
=48;
(4)[3
1 |
4 |
1 |
3 |
1 |
20 |
=[
13 |
4 |
1 |
5 |
1 |
3 |
=[
13 |
4 |
8 |
15 |
7 |
2 |
=[
13 |
4 |
28 |
15 |
=
83 |
60 |
61 |
10 |
=
83 |
366 |
点评:当算式中同时含有分数与小数时,要根据式中数据的特点灵活将它们互化后再进行计算.
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