题目内容
用简便方法计算.
3-
-
;
÷3+
×
; 100×﹙
+
﹚;
×8-
.
3-
| 5 |
| 14 |
| 9 |
| 14 |
| 7 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 4 |
| 25 |
| 1 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)运用减法性质解答,
(2)(3)(4)运用乘法分配律解答.
(2)(3)(4)运用乘法分配律解答.
解答:
解:(1)3-
-
=3-(
+
)
=3-1
=2;
(2)
÷3+
×
=
×(
+
)
=
×2
=
;
(3)100×﹙
+
﹚
=100×
+100×
=16+25
=41;
(4)
×8-
=
×(8-1)
=
×7
=6.
| 5 |
| 14 |
| 9 |
| 14 |
=3-(
| 5 |
| 14 |
| 9 |
| 14 |
=3-1
=2;
(2)
| 7 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 7 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 3 |
=
| 2 |
| 3 |
(3)100×﹙
| 4 |
| 25 |
| 1 |
| 4 |
=100×
| 4 |
| 25 |
| 1 |
| 4 |
=16+25
=41;
(4)
| 6 |
| 7 |
| 6 |
| 7 |
=
| 6 |
| 7 |
=
| 6 |
| 7 |
=6.
点评:正确选择并运用简便方法解决问题是本题考查知识点.
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