题目内容

怎样算简便就怎样算.
1
2
×3+
1
2
×5

4×(
3
16
+
3
4
)

7
9
×
3
10
+
7
10
×
7
9

3
5
×6-
3
5

8-14×
2
7

4
9
×
1
3
+
5
9
÷3
分析:(1)(2)(3)(4)运用乘法分配律简算;
(5)先算乘法,再算减法;
(6)把除法改为乘法,运用乘法分配律简算.
解答:解:(1)
1
2
×3+
1
2
×5,
=
1
2
×(3+5),
=
1
2
×8,
=4;
(2)4×(
3
16
+
3
4
),
=4×
3
16
+
3
4
×4,
=
3
4
+3,
=3
3
4


(3)
7
9
×
3
10
+
7
10
×
7
9

=
7
9
×(
3
10
+
7
10
),
=
7
9
×1,
=
7
9


(4)
3
5
×6-
3
5

=
3
5
×(6-1),
=
3
5
×5,
=3;

(5)8-14×
2
7

=8-4,
=4;

(6)
4
9
×
1
3
+
5
9
÷3,
=
4
9
×
1
3
+
5
9
×
1
3

=(
4
9
+
5
9
)×
1
3

=1×
1
3

=
1
3
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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