题目内容
计算,能简算的要简算.
+
+
+
;
+3.5×
÷0.2; (
+
)×
÷
; (
+
)×45.
| 4 |
| 9 |
| 3 |
| 8 |
| 5 |
| 9 |
| 5 |
| 8 |
| 2 |
| 3 |
| 1 |
| 5 |
| 8 |
| 9 |
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 12 |
| 4 |
| 15 |
| 7 |
| 9 |
考点:分数的简便计算
专题:运算顺序及法则
分析:(1)利用加法交换律与结合律进行计算;
(2)先算乘除法,后算加法;
(3)先算小括号内的,再算括号外的乘法,最后算除法;
(4)利用乘法分配律进行简算.
(2)先算乘除法,后算加法;
(3)先算小括号内的,再算括号外的乘法,最后算除法;
(4)利用乘法分配律进行简算.
解答:
解:(1)
+
+
+
=(
+
)+(
+
)
=1+1
=2
(2)
+3.5×
÷0.2
=
+0.7÷0.2
=
+
=
(3)(
+
)×
÷
=
×
×12
=11
(4)(
+
)×45
=
×45+
×45
=12+35
=47
| 4 |
| 9 |
| 3 |
| 8 |
| 5 |
| 9 |
| 5 |
| 8 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 3 |
| 8 |
| 5 |
| 8 |
=1+1
=2
(2)
| 2 |
| 3 |
| 1 |
| 5 |
=
| 2 |
| 3 |
=
| 4 |
| 6 |
| 21 |
| 6 |
=
| 25 |
| 6 |
(3)(
| 8 |
| 9 |
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 12 |
=
| 11 |
| 9 |
| 3 |
| 4 |
=11
(4)(
| 4 |
| 15 |
| 7 |
| 9 |
=
| 4 |
| 15 |
| 7 |
| 9 |
=12+35
=47
点评:主要考查学生对四则运算法则和运算定律的掌握.
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