题目内容
(2012?零陵区模拟)计算下面各题.(能简算的要简算)
85-3
÷9
×
÷(
-
)
×
+0.25×
0.6×25%+
×4.
85-3
3 |
8 |
1 |
6 |
2 |
3 |
4 |
5 |
8 |
15 |
2 |
7 |
3 |
4 |
2 |
7 |
0.6×25%+
1 |
3 |
分析:算式(1)(2)(4)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
算式(3)根据乘法分配律计算即可.
算式(3)根据乘法分配律计算即可.
解答:解:(1)85-3
÷9
=85-
×
,
=85-
,
=84
;
(2)
×
÷(
-
)
=
×
÷
,
=
×
,
=
;
(3)
×
+0.25×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)0.6×25%+
×4
=
×
+
,
=
+
,
=
.
3 |
8 |
=85-
27 |
8 |
1 |
9 |
=85-
3 |
8 |
=84
5 |
8 |
(2)
1 |
6 |
2 |
3 |
4 |
5 |
8 |
15 |
=
1 |
6 |
2 |
3 |
4 |
15 |
=
1 |
9 |
15 |
4 |
=
5 |
12 |
(3)
2 |
7 |
3 |
4 |
2 |
7 |
=
2 |
7 |
3 |
4 |
1 |
4 |
2 |
7 |
=(
3 |
4 |
1 |
4 |
2 |
7 |
=1×
2 |
7 |
=
2 |
7 |
(4)0.6×25%+
1 |
3 |
=
3 |
5 |
1 |
4 |
4 |
3 |
=
3 |
20 |
4 |
3 |
=
89 |
60 |
点评:当算式中同时含有分数与小数时,要根据式中数据的特点灵活将它们进行互化后再进行计算.
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