题目内容
(2012?陆良县模拟)36.8-44.08÷5.8
1
×90+1
×26+1
×1
×
÷
0.4×4.7×2.5+(2
+5.3)
[5
-1.04×(1
+
)]÷2.9.
1
7 |
13 |
7 |
13 |
7 |
13 |
5 |
16 |
1 |
3 |
3 |
5 |
2 |
15 |
0.4×4.7×2.5+(2
1 |
3 |
[5
1 |
2 |
2 |
3 |
5 |
6 |
分析:(1)先算除法,再算减法;
(2)运用乘法分配律简算;
(3)按照从左到右的顺序计算;
(4)先运用乘法交换律简算,再运用加法结合律简算;
(5)先算小括号里面的加法,再算中括号里面的乘法,然后算中括号里面里面的减法,最后算括号外的除法.
(2)运用乘法分配律简算;
(3)按照从左到右的顺序计算;
(4)先运用乘法交换律简算,再运用加法结合律简算;
(5)先算小括号里面的加法,再算中括号里面的乘法,然后算中括号里面里面的减法,最后算括号外的除法.
解答:解:(1)36.8-44.08÷5.8,
=36.8-7.6,
=29.2;
(2)1
×90+1
×26+1
,
=1
×(90+26+1)
=
×117,
=180;
(3)
×1
×
÷
,
=
×
×
×
,
=
×
×
,
=
×
,
=
;
(4)0.4×4.7×2.5+(2
+5.3),
=0.4×2.5×4.7+(2
+5.3),
=1×4.7+(2
+5.3),
=4.7+2
+5.3,
=4.7+5.3+2
,
=10+2
,
=12
;
(5)[5
-1.04×(1
+
)]÷2.9,
=[5
-1.04×2.5]÷2.9,
=[5
-2.6]÷2.9,
=2.9÷.9,
=1.
=36.8-7.6,
=29.2;
(2)1
7 |
13 |
7 |
13 |
7 |
13 |
=1
7 |
13 |
=
20 |
13 |
=180;
(3)
5 |
16 |
1 |
3 |
3 |
5 |
2 |
15 |
=
5 |
16 |
4 |
3 |
3 |
5 |
15 |
2 |
=
5 |
12 |
3 |
5 |
15 |
2 |
=
1 |
4 |
15 |
2 |
=
15 |
8 |
(4)0.4×4.7×2.5+(2
1 |
3 |
=0.4×2.5×4.7+(2
1 |
3 |
=1×4.7+(2
1 |
3 |
=4.7+2
1 |
3 |
=4.7+5.3+2
1 |
3 |
=10+2
1 |
3 |
=12
1 |
3 |
(5)[5
1 |
2 |
2 |
3 |
5 |
6 |
=[5
1 |
2 |
=[5
1 |
2 |
=2.9÷.9,
=1.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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