题目内容
计算下列各题,怎样简便就怎样算.
6-
×
-
×6÷
×6
×3
+0.25×6
[
-(
+
)]×
.
6-
5 |
3 |
1 |
2 |
1 |
6 |
5 |
6 |
5 |
6 |
1 |
4 |
1 |
4 |
3 |
4 |
[
13 |
8 |
5 |
8 |
5 |
7 |
3 |
4 |
分析:第(1)题,在计算6-
-
时,应用减法的性质简算;
第(2)题,按运算顺序进行计算,不要误算成(
×6)÷(
×6)=1;
第(3)题,把0.25改写成分数,用乘法分配律的逆运算简算;
第(4)题,中括号内去掉小括号用减法的性质简算.
5 |
6 |
1 |
6 |
第(2)题,按运算顺序进行计算,不要误算成(
5 |
6 |
5 |
6 |
第(3)题,把0.25改写成分数,用乘法分配律的逆运算简算;
第(4)题,中括号内去掉小括号用减法的性质简算.
解答:解:(1)6-
×
-
,
=6-
-
,
=6-(
+
),
=6-1,
=5;
(2)
×6÷
×6,
=5×
×6,
=6×6,
=36;
(3)
×3
+0.25×6
,
=
×3
+
×6
,
=(3
+ 6
)×
,
=10×
,
=2
;
(4)[
-(
+
)]×
,
=[
-
-
]×
,
=[1-
]×
,
=
×
,
=
.
5 |
3 |
1 |
2 |
1 |
6 |
=6-
5 |
6 |
1 |
6 |
=6-(
5 |
6 |
1 |
6 |
=6-1,
=5;
(2)
5 |
6 |
5 |
6 |
=5×
6 |
5 |
=6×6,
=36;
(3)
1 |
4 |
1 |
4 |
3 |
4 |
=
1 |
4 |
1 |
4 |
1 |
4 |
3 |
4 |
=(3
1 |
4 |
3 |
4 |
1 |
4 |
=10×
1 |
4 |
=2
1 |
2 |
(4)[
13 |
8 |
5 |
8 |
5 |
7 |
3 |
4 |
=[
13 |
8 |
5 |
8 |
5 |
7 |
3 |
4 |
=[1-
5 |
7 |
3 |
4 |
=
2 |
7 |
3 |
4 |
=
3 |
14 |
点评:此题考查学生对运算顺序的掌握,以及对运算定律的灵活运用.
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