题目内容

简算.
3
4
×
2
5
+
2
5
÷4
9
97
×100-
9
97
×2-
9
97
(
1
2
+
3
5
-
4
7
)×70
(33×
4
9
+
4
9
×33)×
3
8
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律和乘法交换律进行简算.
解答:解:(1)
3
4
×
2
5
+
2
5
÷4

=
3
4
×
2
5
+
2
5
×
1
4

=(
3
4
+
1
4
)×
2
5

=1×
2
5

=
2
5


(2)
9
97
×100-
9
97
×2-
9
97

=
9
97
×(100-2-1)

=
9
97
×97

=9;

(3)(
1
2
+
3
5
-
4
7
)×70

=
1
2
×70+
3
5
×70-
4
7
×70

=35+42-40
=77-40
=37;

(4)(33×
4
9
+
4
9
×33)×
3
8

=(
4
9
+
4
9
)×33×
3
8

=
8
9
×33×
3
8

=
8
9
×
3
8
×33
=
1
3
×33
=11.
点评:此题主要考查分数的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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