题目内容
(2008?常熟市)
列递等式计算,能简算的要简算. 9470-104×65 |
4.49+4.84+4.51+4.16 | 88×(
| ||||||||||||||||||||||||
[
|
[
|
|
分析:(1)先算乘法,再算减法;
(2)运用加法交换律与结合律简算;
(3)运用乘法分配律简算;
(4)(5)(6)先算小括号内的,再算中括号内的,最后算括号外的.
(2)运用加法交换律与结合律简算;
(3)运用乘法分配律简算;
(4)(5)(6)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)9470-104×65,
=9470-6760,
=2710;
(2)4.49+4.84+4.51+4.16,
=(4.49+4.51)+(4.84+4.16),
=9+9,
=18;
(3)88×(
-
),
=88×
-
×88,
=40-22,
=18;
(4)[
-(
-
)]÷
,
=[
+
-
]÷
,
=[1-
]×4,
=
×4,
=1;
(5)[
-(
-
)]÷
,
=[
-
]÷
,
=
×
,
=
;
(6)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
.
=9470-6760,
=2710;
(2)4.49+4.84+4.51+4.16,
=(4.49+4.51)+(4.84+4.16),
=9+9,
=18;
(3)88×(
5 |
11 |
1 |
4 |
=88×
5 |
11 |
1 |
4 |
=40-22,
=18;
(4)[
3 |
5 |
3 |
4 |
2 |
5 |
1 |
4 |
=[
3 |
5 |
2 |
5 |
3 |
4 |
1 |
4 |
=[1-
3 |
4 |
=
1 |
4 |
=1;
(5)[
3 |
4 |
5 |
6 |
2 |
3 |
5 |
4 |
=[
3 |
4 |
1 |
6 |
5 |
4 |
=
1 |
2 |
4 |
5 |
=
2 |
5 |
(6)
9 |
20 |
1 |
2 |
2 |
5 |
4 |
5 |
=
9 |
20 |
1 |
2 |
6 |
5 |
=
9 |
20 |
3 |
5 |
=
9 |
20 |
5 |
3 |
=
3 |
4 |
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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