题目内容
下面各题怎样算简便就怎样算.
|
|
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2-
|
(
|
[1-(
|
分析:(1)先算除法,再算乘法;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算
(4)先算除法,再根据连减的性质进行计算;
(5)根据乘法分配律进行计算
(6)先算加法,再算减法,最后算除法.
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算
(4)先算除法,再根据连减的性质进行计算;
(5)根据乘法分配律进行计算
(6)先算加法,再算减法,最后算除法.
解答:解:
(1)
÷0.6×
,
=
×
,
=
;
(2)
÷9+
×
=
×
+
×
=(
+
)×
,
=1×
,
=
;
(3)
×101-
,
=
×(101-1),
=
×100,
=28;
(4)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0;
(5)(
-
+
)÷
,
=(
-
+
)×12,
=
×12-
×12+
×12,
=2-4+3,
=1;
(6)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=2.
(1)
| 18 |
| 35 |
| 2 |
| 3 |
=
| 6 |
| 7 |
| 2 |
| 3 |
=
| 4 |
| 7 |
(2)
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
=
| 5 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 12 |
| 17 |
=(
| 5 |
| 17 |
| 12 |
| 17 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
(3)
| 7 |
| 25 |
| 7 |
| 25 |
=
| 7 |
| 25 |
=
| 7 |
| 25 |
=28;
(4)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0;
(5)(
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 12 |
=(
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
=2-4+3,
=1;
(6)[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
=[1-
| 3 |
| 4 |
| 1 |
| 8 |
=
| 1 |
| 4 |
| 1 |
| 8 |
=2.
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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