题目内容
(1)
+25%÷(
-1.5×
)
(2)36×(
+
-
)
(3)(0.5-
)÷0.12×
(4)
+
×(
-
)÷
(5)
×[
+(
-
)].
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
(2)36×(
| 5 |
| 12 |
| 1 |
| 2 |
| 4 |
| 9 |
(3)(0.5-
| 1 |
| 3 |
| 2 |
| 75 |
(4)
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 5 |
(5)
| 3 |
| 4 |
| 7 |
| 16 |
| 8 |
| 9 |
| 3 |
| 4 |
分析:本题据四则混合运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;同时要注意分析式中数据,能简算的要简算.
解答:解:(1)
+25%÷(
-1.5×
)
=
+
÷(
-
×
),
=
+
÷
,
=
+
,
=
;
(2)36×(
+
-
)
=36×
+36×
-36×
,
=15+18-16,
=17;
(3)(0.5-
)÷0.12×
=(
-
)÷
×
,
=
×
×
,
=
;
(4)
+
×(
-
)÷
=
+
×
×5,
=
+
,
=
;
(5)
×[
+(
-
)]
=
×[
+
],
=
×
,
=
.
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 3 |
| 2 |
| 1 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 6 |
| 4 |
=
| 9 |
| 4 |
(2)36×(
| 5 |
| 12 |
| 1 |
| 2 |
| 4 |
| 9 |
=36×
| 5 |
| 12 |
| 1 |
| 2 |
| 4 |
| 9 |
=15+18-16,
=17;
(3)(0.5-
| 1 |
| 3 |
| 2 |
| 75 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 25 |
| 2 |
| 75 |
=
| 1 |
| 6 |
| 25 |
| 3 |
| 2 |
| 75 |
=
| 1 |
| 27 |
(4)
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 5 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 7 |
| 12 |
=
| 1 |
| 2 |
| 35 |
| 18 |
=
| 22 |
| 9 |
(5)
| 3 |
| 4 |
| 7 |
| 16 |
| 8 |
| 9 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 7 |
| 16 |
| 5 |
| 36 |
=
| 3 |
| 4 |
| 83 |
| 144 |
=
| 83 |
| 192 |
点评:完成含有分数的四则混合运算要细心,注意通分、约分.
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