题目内容

脱式计算.(能简算的要简算)
3
8
+
4
9
+
5
8
+
5
9
12.04-5.37-4.63
4
5
+
1
6
+
4
15
)×30;
1
8
×[
1
2
÷(
3
5
×
10
9
)]
32×71.1+28.9×32
1
2
+
1
4
)÷(
4
5
÷4-
1
10
分析:(1)运用加法交换律和结合律即可解答,
(2)依据减法性质解答,
(3)(5)运用乘法分配律解答,
(4)(6)按照四则运算计算顺序解答.
解答:解:(1)
3
8
+
4
9
+
5
8
+
5
9

=(
3
8
+
5
8
)+(
4
9
+
5
9
),
=1+1,
=2;

(2)12.04-5.37-4.63,
=12.04-(5.37+4.63),
=12.04-10,
=2.04;

(3)(
4
5
+
1
6
+
4
15
)×30,
=
4
5
×30+
1
6
×30+
4
15
×30,
=24+5+8,
=29+8,
=37;

(4)
1
8
×[
1
2
÷(
3
5
×
10
9
)],
=
1
8
×[
1
2
÷
2
3
],
=
1
8
×
3
4

=
3
32


(5)32×71.1+28.9×32,
=(71.1+28.9)×32,
=100×32,
=3200;

(6)(
1
2
+
1
4
)÷(
4
5
÷4-
1
10
),
=
3
4
÷
1
5
-
1
10
),
=
3
4
÷
1
10

=7.5.
点评:本题考查知识点:(1)四则运算计算顺序,(2)简便算法正确运用.
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