题目内容
计算下面各题,能简算的用简便方法计算.
+
+
+
; 0.5+8÷
-
;
×
+
×
;
÷[
÷(
-
)].
| 1 |
| 4 |
| 1 |
| 7 |
| 3 |
| 4 |
| 13 |
| 7 |
| 8 |
| 5 |
| 1 |
| 2 |
| 5 |
| 9 |
| 5 |
| 11 |
| 5 |
| 9 |
| 6 |
| 11 |
| 3 |
| 8 |
| 3 |
| 4 |
| 15 |
| 16 |
| 7 |
| 8 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先运用加法的交换律结合律把同分母分数相加,再计算;
(2)先算除法,再算0.5-
最后与5相加;
(3)运用乘法分配律简化运算;
(4)先算小括号里的减法,再算中括号里的除法,最后再算括号外的除法.
(2)先算除法,再算0.5-
| 1 |
| 2 |
(3)运用乘法分配律简化运算;
(4)先算小括号里的减法,再算中括号里的除法,最后再算括号外的除法.
解答:
解:(1)
+
+
+
=(
+
)+(
+
)
=1+2
=3;
(2)0.5+8÷
-
=0.5+5-
=0.5-
+5
=5;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)
÷[
÷(
-
)]
=
÷(
÷
)
=
÷12
=
.
| 1 |
| 4 |
| 1 |
| 7 |
| 3 |
| 4 |
| 13 |
| 7 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 7 |
| 13 |
| 7 |
=1+2
=3;
(2)0.5+8÷
| 8 |
| 5 |
| 1 |
| 2 |
=0.5+5-
| 1 |
| 2 |
=0.5-
| 1 |
| 2 |
=5;
(3)
| 5 |
| 9 |
| 5 |
| 11 |
| 5 |
| 9 |
| 6 |
| 11 |
=
| 5 |
| 9 |
| 5 |
| 11 |
| 6 |
| 11 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(4)
| 3 |
| 8 |
| 3 |
| 4 |
| 15 |
| 16 |
| 7 |
| 8 |
=
| 3 |
| 8 |
| 3 |
| 4 |
| 1 |
| 16 |
=
| 3 |
| 8 |
=
| 1 |
| 32 |
点评:本题考查了分数的四则混合运算,熟练掌握运算顺序是解题的关键.
练习册系列答案
相关题目