题目内容
计算下列各题,能简算的要简算
|
(
|
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|
|
|
分析:(1)运用乘法分配律简算;
(2)同时运算两个小括号里面的减法和乘法,再算括号外的除法;
(3)运用乘法结合律简算;
(4)运用加法交换律和加法结合律简算;
(5)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的除法;
(6)先算小括号里面的加法,再算括号外的乘法,最后算除法.
(2)同时运算两个小括号里面的减法和乘法,再算括号外的除法;
(3)运用乘法结合律简算;
(4)运用加法交换律和加法结合律简算;
(5)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的除法;
(6)先算小括号里面的加法,再算括号外的乘法,最后算除法.
解答:解:(1)
×5.16+516%×
,
=
×5.16+5.16×
,
=5.16×(
+
),
=5.16×1,
=5.16;
(2)(
-
)÷(
×
),
=
÷
,
=
;
(3)
×
×
,
=
×(
×
),
=
×
,
=
;
(4)
+
+
+6.1,
=(
+
)+(6.1+3.9),
=10+10,
=20;
(5)
÷(
+
×
),
=
÷(
+
),
=
÷
,
=
;
(6)
×(0.65+
)÷
,
=
×1÷
,
=
×7,
=
.
| 13 |
| 18 |
| 5 |
| 18 |
=
| 13 |
| 18 |
| 5 |
| 18 |
=5.16×(
| 13 |
| 18 |
| 5 |
| 18 |
=5.16×1,
=5.16;
(2)(
| 8 |
| 9 |
| 1 |
| 3 |
| 7 |
| 18 |
| 2 |
| 3 |
=
| 5 |
| 9 |
| 7 |
| 27 |
=
| 15 |
| 7 |
(3)
| 9 |
| 10 |
| 4 |
| 13 |
| 13 |
| 18 |
=
| 9 |
| 10 |
| 4 |
| 13 |
| 13 |
| 18 |
=
| 9 |
| 10 |
| 2 |
| 9 |
=
| 1 |
| 5 |
(4)
| 47 |
| 6 |
| 39 |
| 10 |
| 13 |
| 6 |
=(
| 47 |
| 6 |
| 13 |
| 6 |
=10+10,
=20;
(5)
| 4 |
| 5 |
| 1 |
| 5 |
| 5 |
| 8 |
| 4 |
| 7 |
=
| 4 |
| 5 |
| 1 |
| 5 |
| 5 |
| 14 |
=
| 4 |
| 5 |
| 39 |
| 70 |
=
| 56 |
| 39 |
(6)
| 1 |
| 8 |
| 7 |
| 20 |
| 1 |
| 7 |
=
| 1 |
| 8 |
| 1 |
| 7 |
=
| 1 |
| 8 |
=
| 7 |
| 8 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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