题目内容
(2011?石阡县)简便计算.
+
+
+
(
+
)÷
÷
+
×
3-
×
-
.
5 |
6 |
9 |
10 |
1 |
6 |
1 |
10 |
(
1 |
4 |
5 |
6 |
1 |
24 |
3 |
7 |
5 |
2 |
2 |
5 |
4 |
7 |
3-
3 |
2 |
10 |
21 |
2 |
7 |
分析:第(1)题应用加法交换律、结合律简便计算,
第(2)、(3)题应用乘法分配律简便计算,
第(4)题先计算乘法在运用c-a-b=c-(a+b)的形式进行计算.
第(2)、(3)题应用乘法分配律简便计算,
第(4)题先计算乘法在运用c-a-b=c-(a+b)的形式进行计算.
解答:解:(1)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(2)(
+
)÷
,
=(
+
)×24,
=
×24+
×24,
=6+20,
=26;
(3)
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)3-
×
-
,
=3-
-
,
=3-(
+
),
=3-1,
=2.
5 |
6 |
9 |
10 |
1 |
6 |
1 |
10 |
=(
5 |
6 |
1 |
6 |
1 |
10 |
9 |
10 |
=1+1,
=2;
(2)(
1 |
4 |
5 |
6 |
1 |
24 |
=(
1 |
4 |
5 |
6 |
=
1 |
4 |
5 |
6 |
=6+20,
=26;
(3)
3 |
7 |
5 |
2 |
2 |
5 |
4 |
7 |
=
3 |
7 |
2 |
5 |
2 |
5 |
4 |
7 |
=
2 |
5 |
3 |
7 |
4 |
7 |
=
2 |
5 |
=
2 |
5 |
(4)3-
3 |
2 |
10 |
21 |
2 |
7 |
=3-
5 |
7 |
2 |
7 |
=3-(
5 |
7 |
2 |
7 |
=3-1,
=2.
点评:此题主要考查分数四则混合运算的运算顺序和应用运算定律进行简便计算
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