题目内容
(2007?河池)用你喜欢的方法计算
(1)275-450÷18
(2)
-
+
-
(3)
÷6+1÷6×
(4)
×
÷(
-
).
(1)275-450÷18
(2)
3 |
4 |
2 |
7 |
1 |
4 |
5 |
7 |
(3)
9 |
25 |
6 |
25 |
(4)
1 |
6 |
2 |
3 |
4 |
5 |
8 |
15 |
分析:(1)先算除法,再算减法解答,
(2)运用加法交换律以及减法性质解答,
(3)运用乘法分配律解答,
(4)先算括号里面的再按照从左到右顺序解答.
(2)运用加法交换律以及减法性质解答,
(3)运用乘法分配律解答,
(4)先算括号里面的再按照从左到右顺序解答.
解答:解:(1)275-450÷18,
=275-25,
=250;
(2)
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0;
(3)
÷6+1÷6×
,
=(
+
)×
,
=
×
,
=
;
(4)
×
÷(
-
),
=
×
÷
,
=
÷
,
=
.
=275-25,
=250;
(2)
3 |
4 |
2 |
7 |
1 |
4 |
5 |
7 |
=(
3 |
4 |
1 |
4 |
2 |
7 |
5 |
7 |
=1-1,
=0;
(3)
9 |
25 |
6 |
25 |
=(
9 |
25 |
6 |
25 |
1 |
6 |
=
3 |
5 |
1 |
6 |
=
1 |
10 |
(4)
1 |
6 |
2 |
3 |
4 |
5 |
8 |
15 |
=
1 |
6 |
2 |
3 |
4 |
15 |
=
1 |
9 |
4 |
15 |
=
5 |
12 |
点评:有简便算法的,要选择并正确的运用简便算法解答,没有简便算法的就要按照四则运算计算方法解答.
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