题目内容
脱式计算
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算乘法和除法,再算加法;
(2)先算减法,再算中括号里面的乘法,最后算括号外面的乘法;
(3)先算减法,再算除法,最后算加法;
(4)先算加法,再算减法,最后算乘法;
(5)先算乘法,再按照从左向右的顺序进行计算;
(6)先算加法,再算减法,最后算除法;
(7)小括号里面按照从左向右的顺序进行计算,最后算除法;
(8)先算减法和加法,最后算乘法.
(2)先算减法,再算中括号里面的乘法,最后算括号外面的乘法;
(3)先算减法,再算除法,最后算加法;
(4)先算加法,再算减法,最后算乘法;
(5)先算乘法,再按照从左向右的顺序进行计算;
(6)先算加法,再算减法,最后算除法;
(7)小括号里面按照从左向右的顺序进行计算,最后算除法;
(8)先算减法和加法,最后算乘法.
解答:
解:(1)
×
+
÷
=
+
=
;
(2)
×[(
-
)×
]
=
×[
×
]
=
×
=
;
(3)
÷(3-
)+
=
÷
+
=
+
=
;
(4)[
-(
+
)]×
=[
-
]×
=
×
=
;
(5)
+
×
+1
=
+
+1
=
+1
=1
;
(6)
÷[
-(
+
)]
=
÷[
-
]
=
÷
=
;
(7)
÷(1-
-
)
=
÷(
-
)
=
÷
=1;
(8)(
-
)×(
+
)
=
×
=
.
| 9 |
| 5 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 7 |
=
| 6 |
| 5 |
| 7 |
| 10 |
=
| 19 |
| 10 |
(2)
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 5 |
=
| 2 |
| 3 |
| 7 |
| 12 |
| 1 |
| 5 |
=
| 2 |
| 3 |
| 7 |
| 60 |
=
| 7 |
| 90 |
(3)
| 6 |
| 5 |
| 6 |
| 5 |
| 11 |
| 4 |
=
| 6 |
| 5 |
| 9 |
| 5 |
| 11 |
| 4 |
=
| 2 |
| 3 |
| 11 |
| 4 |
=
| 41 |
| 12 |
(4)[
| 16 |
| 5 |
| 3 |
| 4 |
| 3 |
| 2 |
| 10 |
| 9 |
=[
| 16 |
| 5 |
| 9 |
| 4 |
| 10 |
| 9 |
=
| 19 |
| 20 |
| 10 |
| 9 |
=
| 19 |
| 18 |
(5)
| 1 |
| 12 |
| 1 |
| 4 |
| 7 |
| 6 |
| 1 |
| 8 |
=
| 1 |
| 12 |
| 7 |
| 24 |
| 1 |
| 8 |
=
| 3 |
| 8 |
| 1 |
| 8 |
=1
| 1 |
| 2 |
(6)
| 19 |
| 25 |
| 9 |
| 5 |
| 1 |
| 5 |
| 1 |
| 3 |
=
| 19 |
| 25 |
| 9 |
| 5 |
| 8 |
| 15 |
=
| 19 |
| 25 |
| 19 |
| 15 |
=
| 3 |
| 5 |
(7)
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=1;
(8)(
| 7 |
| 8 |
| 5 |
| 16 |
| 5 |
| 9 |
| 2 |
| 3 |
=
| 9 |
| 16 |
| 11 |
| 9 |
=
| 11 |
| 16 |
点评:考查了分数四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
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