题目内容
用你喜欢的方法计算.
| (
| 2-
| ||||||||||||||||||
1-(
|
|
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)运用乘法分配律简算;
(3)先算除法,再运用减法的性质简算;
(4)先算小括号里面的加法,再算括号外的除法,最后算减法;
(5)先算小括号里面的减法,再算乘法,最后算除法;
(6)按照从左到右的顺序计算.
(2)运用乘法分配律简算;
(3)先算除法,再运用减法的性质简算;
(4)先算小括号里面的加法,再算括号外的除法,最后算减法;
(5)先算小括号里面的减法,再算乘法,最后算除法;
(6)按照从左到右的顺序计算.
解答:
解:(1)
÷7+
×
=
×
+
×
=(
+
)×
=
×
=
;
(2)(
+
-
)×12
=
×12+
×12-
×12
=9+8-2
=15;
(3)2-
÷
-
=2-
-
=2-(
+
)
=2-2
=0;
(4)1-(
+
)÷
=1-
÷
=1-
=-
;
(5)
×
÷(
-
)
=
×
÷
=
×
=
;
(6)
×0.375÷
=
×
÷
=
×
=
.
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(2)(
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=9+8-2
=15;
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2
=0;
(4)1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=1-
| 5 |
| 8 |
| 1 |
| 4 |
=1-
| 5 |
| 2 |
=-
| 3 |
| 2 |
(5)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
=
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 15 |
=
| 1 |
| 9 |
| 15 |
| 4 |
=
| 5 |
| 12 |
(6)
| 2 |
| 9 |
| 6 |
| 7 |
=
| 2 |
| 9 |
| 3 |
| 8 |
| 6 |
| 7 |
=
| 1 |
| 12 |
| 7 |
| 6 |
=
| 7 |
| 72 |
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定律进行简便计算.
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