题目内容
怎样算简便就怎样算.
6÷
+
÷6
×
÷(
-
)
9×
-
÷
2-
÷
-
.
6÷
| 3 |
| 10 |
| 3 |
| 10 |
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
9×
| 7 |
| 15 |
| 4 |
| 15 |
| 1 |
| 9 |
2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算加法;
(2)先算乘法和减法,再算除法;
(3)利用乘法分配律简算;
(4)先算除法,再利用减法的性质简算.
(2)先算乘法和减法,再算除法;
(3)利用乘法分配律简算;
(4)先算除法,再利用减法的性质简算.
解答:
解:(1)6÷
+
÷6
=6×
+
×
=20+
=20
;
(2)
×
÷(
-
)
=
÷
=
×3
=
;
(3)9×
-
÷
=9×
-
×9
=9×(
-
)
=9×
=
;
(4)2-
÷
-
=2-
×
-
=2-
-
=2-(
+
)
=2-2
=0.
| 3 |
| 10 |
| 3 |
| 10 |
=6×
| 10 |
| 3 |
| 3 |
| 10 |
| 1 |
| 6 |
=20+
| 1 |
| 20 |
=20
| 1 |
| 20 |
(2)
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
=
| 3 |
| 4 |
(3)9×
| 7 |
| 15 |
| 4 |
| 15 |
| 1 |
| 9 |
=9×
| 7 |
| 15 |
| 4 |
| 15 |
=9×(
| 7 |
| 15 |
| 4 |
| 15 |
=9×
| 1 |
| 5 |
=
| 9 |
| 5 |
(4)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2
=0.
点评:混合运算的关键是搞清运算顺序,正确按运算顺序计算,适当利用运算定律简算.
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