题目内容
计算.(能简算的要用简便方法计算)
(1)
|
(2)12×(1-
| ||||||||||||||||
(3)(
|
(4)
| ||||||||||||||||
(5)10-(39÷
|
(6)2-(
|
分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算减法,最后算乘法;
(3)先算乘法,再算加法,最后算除法;
(4)中括号里面的根据减法性质进行简算,最后算乘法;
(5)先算除法,再算加法,最后算减法;
(6)先算加法,再算乘法,最后算加法.
(2)先算除法,再算减法,最后算乘法;
(3)先算乘法,再算加法,最后算除法;
(4)中括号里面的根据减法性质进行简算,最后算乘法;
(5)先算除法,再算加法,最后算减法;
(6)先算加法,再算乘法,最后算加法.
解答:解:
(1)
÷6+
×
,
=
×
+
×
,
=(
+
)×
,
=
;
(2)12×(1-
÷
),
=12×(1-
),
=12×
;
=
;
(3)(
×
+
)÷
,
=(
+
)÷
,
=2÷
,
=5;
(4)
×[
-(
-
)],
=
×[
-
+
],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
;
(5)10-(39÷
+
),
=10-(9+
),
=10-9
,
=
;
(6)2-(
+
)×
,
=2-
×
,
=2-
,
=
.
(1)
| 4 |
| 9 |
| 5 |
| 9 |
| 1 |
| 6 |
=
| 4 |
| 9 |
| 1 |
| 6 |
| 5 |
| 9 |
| 1 |
| 6 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 1 |
| 6 |
=
| 1 |
| 6 |
(2)12×(1-
| 2 |
| 3 |
| 3 |
| 4 |
=12×(1-
| 8 |
| 9 |
=12×
| 1 |
| 9 |
=
| 4 |
| 3 |
(3)(
| 21 |
| 26 |
| 13 |
| 7 |
| 1 |
| 2 |
| 2 |
| 5 |
=(
| 3 |
| 2 |
| 1 |
| 2 |
| 2 |
| 5 |
=2÷
| 2 |
| 5 |
=5;
(4)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
(5)10-(39÷
| 13 |
| 3 |
| 9 |
| 13 |
=10-(9+
| 9 |
| 13 |
=10-9
| 9 |
| 13 |
=
| 4 |
| 13 |
(6)2-(
| 1 |
| 4 |
| 1 |
| 7 |
| 4 |
| 11 |
=2-
| 11 |
| 28 |
| 4 |
| 11 |
=2-
| 1 |
| 7 |
=
| 13 |
| 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律简便计算.
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