题目内容
(1)18×
|
(2)87×
| ||||||||||||||
(3)
|
(4)(
| ||||||||||||||
(5)36×
|
(6)
|
分析:(1)先算乘法和除法,再算加法;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算乘法和除法,再算减法;
(6)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算乘法和除法,再算减法;
(6)根据乘法分配律进行简算.
解答:解:(1)18×
+6÷
=12+9
=21;
(2)87×
=(86+1)×
=86×
+1×
=3+
=3
;
(3)
×
+
÷
=
×
+
×
=
×(
+
)
=
;
(4)(
+
-
)×18
=
×18+
×18-
×18
=8+15-6
=23-6
=17;
(5)36×
-3÷
=27-12
=15;
(6)
×
-
=(
-1)×
=
×
=
.
| 2 |
| 3 |
| 2 |
| 3 |
=12+9
=21;
(2)87×
| 3 |
| 86 |
=(86+1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
(3)
| 5 |
| 9 |
| 4 |
| 7 |
| 3 |
| 7 |
| 9 |
| 5 |
=
| 5 |
| 9 |
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 9 |
=
| 5 |
| 9 |
| 4 |
| 7 |
| 3 |
| 7 |
=
| 5 |
| 9 |
(4)(
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 3 |
=8+15-6
=23-6
=17;
(5)36×
| 3 |
| 4 |
| 1 |
| 4 |
=27-12
=15;
(6)
| 19 |
| 12 |
| 3 |
| 14 |
| 3 |
| 14 |
=(
| 19 |
| 12 |
| 3 |
| 14 |
=
| 7 |
| 12 |
| 3 |
| 14 |
=
| 1 |
| 8 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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