题目内容
能简算的要简算
×
+
×
;
÷(
+
×
); (
-
)÷12.5%;
÷(1-40%+
).
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| 6 |
| 1 |
| 9 |
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| 8 |
| 9 |
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| 21 |
| 40 |
| 3 |
| 5 |
考点:整数、分数、小数、百分数四则混合运算,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)运用乘法的分配律进行简算;
(2)先算小括号里的乘法,再算小括号里的加法,最后算括号外的除法;
(3)先算小括号里的减法,再算括号外的除法;
(4)先算小括号里的运算,再算括号外的除法.
(2)先算小括号里的乘法,再算小括号里的加法,最后算括号外的除法;
(3)先算小括号里的减法,再算括号外的除法;
(4)先算小括号里的运算,再算括号外的除法.
解答:
解:(1)
×
+
×
=
×
+
×
=(
+
)×
=1×
=
;
(2)
÷(
+
×
)
=
÷(
+
)
=
÷
=
;
(3)(
-
)÷12.5%
=
÷12.5%
=
;
(4)
÷(1-40%+
)
=
÷(
+
)
=
÷
=
.
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| 3 |
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=
| 1 |
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| 3 |
| 3 |
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| 2 |
| 3 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 3 |
=1×
| 2 |
| 3 |
=
| 2 |
| 3 |
(2)
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| 6 |
| 1 |
| 9 |
| 3 |
| 4 |
| 8 |
| 9 |
=
| 5 |
| 6 |
| 1 |
| 9 |
| 2 |
| 3 |
=
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| 5 |
| 9 |
=
| 3 |
| 2 |
(3)(
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| 6 |
| 2 |
| 3 |
=
| 1 |
| 6 |
=
| 1 |
| 48 |
(4)
| 21 |
| 40 |
| 3 |
| 5 |
=
| 21 |
| 40 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 21 |
| 40 |
| 6 |
| 5 |
=
| 7 |
| 16 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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