题目内容

下面各题,怎样算简便就怎样算.
(8×
3
4
+6)÷
1
12
8×75%-3÷
3
4
8.5×0.75+7.5×75%
3
4
×88+
1
4
÷
1
88
1
8
÷12.5%×(
3
4
+
1
2
5
8
-
5
6
×(
1
4
+25%)
分析:(1)(8×
3
4
+6)÷
1
12
,(2)8×75%-3÷
3
4
,(5)
1
8
÷12.5%×(
3
4
+
1
2
),(6)
5
8
-
5
6
×(
1
4
+25%),可直接按运算顺序计算;
(3)8.5×0.75+7.5×75%,(4)
3
4
×88+
1
4
÷
1
88
可按乘法分配律算.
解答:解:(1)(8×
3
4
+6)÷
1
12

=(6+6)÷
1
12

=12×12,
=144;
(2)8×75%-3÷
3
4

=8×
3
4
-3×
4
3

=6-4,
=2;
(3)8.5×0.75+7.5×75%,
=8.5×
3
4
+7.5×
3
4

=(8.5+7.5)×
3
4

=16×
3
4

=12;
(4)
3
4
×88+
1
4
÷
1
88

=
3
4
×88+
1
4
×88,
=(
3
4
+
1
4
)×88,
=1×88,
=88;
(5)
1
8
÷12.5%×(
3
4
+
1
2
),
=
1
8
÷
1
8
×
5
4

=1×
5
4

=1
1
4

(6)
5
8
-
5
6
×(
1
4
+25%),
=
5
8
-
5
6
×(
1
4
+
1
4
),
=
5
8
-
5
6
×
1
2

=
5
8
-
5
12

=
5
24
点评:此题考查了整数、分数、小数、百分数四则混合运算的运算顺序以及运算定律的运用.
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