题目内容
(2008?宝应县)下面各题怎样简便就怎样算
360÷15-2.5×1.4=
×
+
÷
=
0.16+4÷(
-
)=
-
+
-
=
360÷15-2.5×1.4=
5 |
6 |
2 |
3 |
4 |
9 |
1 |
6 |
0.16+4÷(
3 |
8 |
1 |
8 |
3 |
7 |
2 |
5 |
4 |
7 |
3 |
5 |
分析:(1)运用乘法分配律简算;(4)运用加法结合律简算;(2)、(3)按照先算乘除,再算加减,有括号的先算括号里面的顺序计算.
解答:解:(1)360÷15-2.5×1.4,
=24-2.5×(1+0.4),
=24-2.5×1-2.5×0.4,
=24-2.5-1,
=21.5-1,
=20.5;
(2)
×
+
÷
,
=
+
×6,
=
+
,
=
;
(3)0.16+4÷(
-
),
=0.16+4÷
,
=0.16+16,
=16.16;
(4)
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0.
=24-2.5×(1+0.4),
=24-2.5×1-2.5×0.4,
=24-2.5-1,
=21.5-1,
=20.5;
(2)
5 |
6 |
2 |
3 |
4 |
9 |
1 |
6 |
=
5 |
9 |
4 |
9 |
=
5 |
9 |
24 |
9 |
=
29 |
9 |
(3)0.16+4÷(
3 |
8 |
1 |
8 |
=0.16+4÷
1 |
4 |
=0.16+16,
=16.16;
(4)
3 |
7 |
2 |
5 |
4 |
7 |
3 |
5 |
=(
3 |
7 |
4 |
7 |
2 |
5 |
3 |
5 |
=1-1,
=0.
点评:本题考查了四则混合运算的计算顺序,计算时要看清楚能否运用简算的方法,若不能就按照运算顺序一步步求解.

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