题目内容
计算(能简算的要简算).
÷(1-
)×
×
+40%×
÷(
+
)
(
+
)×
+
.
| 5 |
| 6 |
| 9 |
| 20 |
| 1 |
| 5 |
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
| 9 |
| 16 |
| 3 |
| 8 |
| 1 |
| 16 |
(
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
分析:(1)先算括号里面的减法,再按照分数乘法的法则进行计算;
(2)、(4)都可以用乘法分配律简算;
(3)先算括号里面的加法,再算外面的除法.
(2)、(4)都可以用乘法分配律简算;
(3)先算括号里面的加法,再算外面的除法.
解答:解:(1)
÷(1-
)×
,
=
×
×
,
=
;
(2)
×
+40%×
,
=
×
+
×
,
=(
+
)×
,
=
;
(3)
÷(
+
),
=
×
,
=
;
(4)(
+
)×
+
,
=
×
+
×
+
,
=
+1,
=1
.
| 5 |
| 6 |
| 9 |
| 20 |
| 1 |
| 5 |
=
| 5 |
| 6 |
| 20 |
| 11 |
| 1 |
| 5 |
=
| 10 |
| 33 |
(2)
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 2 |
| 5 |
| 6 |
| 11 |
| 2 |
| 5 |
| 5 |
| 11 |
=(
| 6 |
| 11 |
| 5 |
| 11 |
| 2 |
| 5 |
=
| 2 |
| 5 |
(3)
| 9 |
| 16 |
| 3 |
| 8 |
| 1 |
| 16 |
=
| 9 |
| 16 |
| 16 |
| 7 |
=
| 9 |
| 7 |
(4)(
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 24 |
| 19 |
| 1 |
| 8 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 3 |
| 19 |
=1
| 3 |
| 19 |
点评:此题考查整数、小数、分数、百分数的四则混合运算,能简算的,就用简便算法计算,不能简算的,要按照运算顺序进行计算.
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