题目内容
| 下面各题,怎样算简便就怎样算. (8×
|
8×75%-3÷
|
8.5×0.75+7.5×75% | ||||||||||||||||||
|
|
|
分析:(1)(8×
+6)÷
,(2)8×75%-3÷
,(5)
÷12.5%×(
+
),(6)
-
×(
+25%),可直接按运算顺序计算;
(3)8.5×0.75+7.5×75%,(4)
×88+
÷
可按乘法分配律算.
| 3 |
| 4 |
| 1 |
| 12 |
| 3 |
| 4 |
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
| 5 |
| 8 |
| 5 |
| 6 |
| 1 |
| 4 |
(3)8.5×0.75+7.5×75%,(4)
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 88 |
解答:解:(1)(8×
+6)÷
,
=(6+6)÷
,
=12×12,
=144;
(2)8×75%-3÷
,
=8×
-3×
,
=6-4,
=2;
(3)8.5×0.75+7.5×75%,
=8.5×
+7.5×
,
=(8.5+7.5)×
,
=16×
,
=12;
(4)
×88+
÷
,
=
×88+
×88,
=(
+
)×88,
=1×88,
=88;
(5)
÷12.5%×(
+
),
=
÷
×
,
=1×
,
=1
;
(6)
-
×(
+25%),
=
-
×(
+
),
=
-
×
,
=
-
,
=
.
| 3 |
| 4 |
| 1 |
| 12 |
=(6+6)÷
| 1 |
| 12 |
=12×12,
=144;
(2)8×75%-3÷
| 3 |
| 4 |
=8×
| 3 |
| 4 |
| 4 |
| 3 |
=6-4,
=2;
(3)8.5×0.75+7.5×75%,
=8.5×
| 3 |
| 4 |
| 3 |
| 4 |
=(8.5+7.5)×
| 3 |
| 4 |
=16×
| 3 |
| 4 |
=12;
(4)
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 88 |
=
| 3 |
| 4 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
=1×88,
=88;
(5)
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 1 |
| 8 |
| 1 |
| 8 |
| 5 |
| 4 |
=1×
| 5 |
| 4 |
=1
| 1 |
| 4 |
(6)
| 5 |
| 8 |
| 5 |
| 6 |
| 1 |
| 4 |
=
| 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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