题目内容

5
9
+
5
6
+
2
9
+
7
6
3
4
+
2
3
+
1
6
)×12
1.25×0.4-0.25×40%
7-
9
17
-
4
17
-
4
17
11
15
÷7-
4
15
÷7.
分析:(1)运用加法交换律与结合律简算;
(2)(3)运用乘法分配律简算;
(4)运用减法的性质简算;
(5)运用除法的性质简算.
解答:解:(1)
5
9
+
5
6
+
2
9
+
7
6

=(
5
9
+
2
9
)+(
5
6
+
7
6
),
=
7
9
+2,
=2
7
9


(2)(
3
4
+
2
3
+
1
6
)×12,
=
3
4
×12+
2
3
×12+
1
6
×12,
=9+8+2,
=19;

(3)1.25×0.4-0.25×40%,
=1.25×0.4-0.25×0.4,
=(1.25-0.25)×0.4,
=1×0.4,
=0.4;

(4)7-
9
17
-
4
17
-
4
17

=7-(
9
17
+
4
17
+
4
17
),
=7-1,
=6;

(5)
11
15
÷7-
4
15
÷7,
=(
11
15
-
4
15
)÷7,
=
7
15
÷7,
=
1
15
点评:完成此题,注意分析式中数据,运用运算定律或性质,进行简算.
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