题目内容
用合适的方法计算.
|
5.2-11÷7-
|
| ||||||||||||||||||||
|
(
|
|
分析:(1)按照从左到右的顺序计算;
(2)先计算除法和乘法,再根据减法的性质简算;
(3)(5)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的加法,再算括号外的除法;
(6)先算小括号里面的减法,再算中括号里面的除法,最后算括号外的除法.
(2)先计算除法和乘法,再根据减法的性质简算;
(3)(5)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的加法,再算括号外的除法;
(6)先算小括号里面的减法,再算中括号里面的除法,最后算括号外的除法.
解答:解:(1)
÷
÷
,
=
×
×
,
=
×
,
=3;
(2)5.2-11÷7-
×3,
=5.2-
-
,
=5.2-(
+
),
=5.2-2,
=3.2;
(3)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)
÷(
+
),
=
÷
,
=
;
(5)(
+
-
)÷
,
=(
+
-
)×12,
=
×12+
×12-
×12,
=3+2-4,
=1;
(6)
÷[1÷(
-
)],
=
÷[1÷
],
=
÷
,
=
.
| 1 |
| 2 |
| 5 |
| 4 |
| 2 |
| 15 |
=
| 1 |
| 2 |
| 4 |
| 5 |
| 15 |
| 2 |
=
| 2 |
| 5 |
| 15 |
| 2 |
=3;
(2)5.2-11÷7-
| 1 |
| 7 |
=5.2-
| 11 |
| 7 |
| 3 |
| 7 |
=5.2-(
| 11 |
| 7 |
| 3 |
| 7 |
=5.2-2,
=3.2;
(3)
| 5 |
| 7 |
| 1 |
| 4 |
| 3 |
| 4 |
| 7 |
| 5 |
=
| 5 |
| 7 |
| 1 |
| 4 |
| 3 |
| 4 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
(4)
| 5 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 5 |
| 8 |
| 3 |
| 4 |
=
| 5 |
| 6 |
(5)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 12 |
=(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2-4,
=1;
(6)
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 5 |
| 7 |
| 7 |
| 15 |
=
| 5 |
| 7 |
| 15 |
| 7 |
=
| 1 |
| 3 |
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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