题目内容
(2003?常州)下面的题怎样简便就怎样算
81.2-11÷7-
×3
÷8+
×
6696÷62-6.5×10.6
[
-(
-
)]÷
.
81.2-11÷7-
1 |
7 |
9 |
13 |
1 |
8 |
7 |
13 |
6696÷62-6.5×10.6
[
3 |
4 |
5 |
6 |
2 |
3 |
5 |
4 |
分析:(1)把除法改为乘法,运用减法的性质简算;
(2)把除法改为乘法,运用乘法分配律简算;
(3)先算除法和乘法,再算减法;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
(2)把除法改为乘法,运用乘法分配律简算;
(3)先算除法和乘法,再算减法;
(4)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)81.2-11÷7-
×3,
=81.2-
-
,
=81.2-(
+
),
=81.2-2,
=79.2;
(2)
÷8+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)6696÷62-6.5×10.6,
=108-68.9,
=39.1;
(4)[
-(
-
)]÷
,
=[
-
]÷
,
=
×
,
=
.
1 |
7 |
=81.2-
11 |
7 |
3 |
7 |
=81.2-(
11 |
7 |
3 |
7 |
=81.2-2,
=79.2;
(2)
9 |
13 |
1 |
8 |
7 |
13 |
=
9 |
13 |
1 |
8 |
1 |
8 |
7 |
13 |
=(
9 |
13 |
7 |
13 |
1 |
8 |
=
16 |
13 |
1 |
8 |
=
2 |
13 |
(3)6696÷62-6.5×10.6,
=108-68.9,
=39.1;
(4)[
3 |
4 |
5 |
6 |
2 |
3 |
5 |
4 |
=[
3 |
4 |
1 |
6 |
5 |
4 |
=
7 |
12 |
4 |
5 |
=
7 |
15 |
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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