题目内容
(
|
| ||||||||||
| 90÷4÷25 | 98×
|
分析:(1)运用乘法的分配律进行简算,
(2)运用乘法的分配律进行简算,
(3)运用除法的性质进行计算,
(4)运用乘法的分配律进行简算.
(2)运用乘法的分配律进行简算,
(3)运用除法的性质进行计算,
(4)运用乘法的分配律进行简算.
解答:解:(1)(
-
)×32,
=
×32-
×32,
=34-28,
=6;
(2)
×
+
÷8,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)90÷4÷25,
=90÷(4×25),
=90÷100,
=0.9;
(4)98×
,
=(99-1)×
,
=99×
-1×
,
=97-
,
=96
.
| 17 |
| 16 |
| 7 |
| 8 |
=
| 17 |
| 16 |
| 7 |
| 8 |
=34-28,
=6;
(2)
| 7 |
| 8 |
| 7 |
| 13 |
| 7 |
| 13 |
=
| 7 |
| 8 |
| 7 |
| 13 |
| 7 |
| 13 |
| 1 |
| 8 |
=(
| 7 |
| 8 |
| 1 |
| 8 |
| 7 |
| 13 |
=1×
| 7 |
| 13 |
=
| 7 |
| 13 |
(3)90÷4÷25,
=90÷(4×25),
=90÷100,
=0.9;
(4)98×
| 97 |
| 99 |
=(99-1)×
| 97 |
| 99 |
=99×
| 97 |
| 99 |
| 97 |
| 99 |
=97-
| 97 |
| 99 |
=96
| 97 |
| 99 |
点评:此题考查了分数四则混合运算的顺序,灵活运用运算定律进行简算即可.
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