题目内容
(1)(
-
×
)÷
(2)4-(
+
)×
(3)
÷(
+
×
)
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 4 |
| 3 |
(2)4-(
| 1 |
| 5 |
| 1 |
| 3 |
| 3 |
| 4 |
(3)
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
分析:(1)根据乘法分配律进行简算;
(2)先算加法,再算乘法,最后算减法;
(3)根据乘法分配律和除法的性质进行简算.
(2)先算加法,再算乘法,最后算减法;
(3)根据乘法分配律和除法的性质进行简算.
解答:解:
(1)(
-
×
)÷
,
=
×(1-
)÷
,
=
×
÷
,
=
÷
,
=
;
(2)4-(
+
)×
,
=4-
×
,
=4-
,
=3
;
(3)
÷(
+
×
),
=
÷[
×(1+
)],
=
÷[
×
],
=
÷
÷
,
=1÷
,
=
.
(1)(
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 4 |
| 3 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 4 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 6 |
| 4 |
| 3 |
=
| 1 |
| 8 |
| 4 |
| 3 |
=
| 3 |
| 32 |
(2)4-(
| 1 |
| 5 |
| 1 |
| 3 |
| 3 |
| 4 |
=4-
| 8 |
| 15 |
| 3 |
| 4 |
=4-
| 2 |
| 5 |
=3
| 3 |
| 5 |
(3)
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
=
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
=
| 2 |
| 5 |
| 2 |
| 5 |
| 7 |
| 4 |
=
| 2 |
| 5 |
| 2 |
| 5 |
| 7 |
| 4 |
=1÷
| 7 |
| 4 |
=
| 4 |
| 7 |
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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