题目内容
(2012?中山模拟)
(1)
|
(2)101×2.85-2.85 | (3)
|
分析:(1)运用乘法分配律简算;
(2)运用乘法分配律简算;
(3)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法.
(2)运用乘法分配律简算;
(3)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法.
解答:解:(1)
×(
+
),
=
×
+
×
,
=1+
,
=1
;
(2)101×2.85-2.85,
=(101-1)×2.85,
=100×2.85,
=285;
(3)
÷[(
+
)÷
],
=
÷[
÷
],
=
÷
,
=
.
| 7 |
| 3 |
| 3 |
| 7 |
| 3 |
| 28 |
=
| 7 |
| 3 |
| 3 |
| 7 |
| 3 |
| 28 |
| 7 |
| 3 |
=1+
| 1 |
| 4 |
=1
| 1 |
| 4 |
(2)101×2.85-2.85,
=(101-1)×2.85,
=100×2.85,
=285;
(3)
| 3 |
| 5 |
| 1 |
| 5 |
| 1 |
| 3 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 8 |
| 15 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 12 |
| 5 |
=
| 1 |
| 4 |
点评:本题考查了四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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