题目内容
(1)(
-
)×(
+
)
(2)
÷7+
×
(3)1-(
+
)÷
(4)
÷
+
×
.
| 7 |
| 8 |
| 5 |
| 16 |
| 5 |
| 9 |
| 2 |
| 3 |
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
(3)1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
(4)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
分析:(1)先算减法和加法,再算乘法;
(2)根据乘法分配律进行简算;
(3)先算加法,再算除法,最后算减法;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)先算加法,再算除法,最后算减法;
(4)根据乘法分配律进行简算.
解答:解:(1)(
-
)×(
+
),
=
×
,
=
;
(2)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)1-(
+
)÷
,
=1-
÷
,
=1-
,
=-
;
(4)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=
.
| 7 |
| 8 |
| 5 |
| 16 |
| 5 |
| 9 |
| 2 |
| 3 |
=
| 9 |
| 16 |
| 11 |
| 9 |
=
| 11 |
| 16 |
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(3)1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=1-
| 5 |
| 8 |
| 1 |
| 4 |
=1-
| 5 |
| 2 |
=-
| 3 |
| 2 |
(4)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 5 |
| 11 |
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律简便计算.
练习册系列答案
相关题目