题目内容
计算,能简算的要简算.
|
(
|
|
|
分析:(1)先算小括号里面的减法,再算中括号里面的加法,最后算乘法;
(2)根据乘法分配律进行简算;
(3)先把除法转化成乘法,再根据乘法分配律进行简算;
(4)根据连减的性质算小括号里面的,最后算除法.
(2)根据乘法分配律进行简算;
(3)先把除法转化成乘法,再根据乘法分配律进行简算;
(4)根据连减的性质算小括号里面的,最后算除法.
解答:解:
(1)
×[
+(
-
)],
=
×[
+
],
=
×
,
=
;
(2)(
+
)×24,
=
×24+
×24,
=9+2,
=11;
(3)
÷9+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
÷(17-
-
),
=
÷[17-(
+
)],
=
÷[17-1],
=
÷16,
=
.
(1)
| 8 |
| 9 |
| 1 |
| 4 |
| 9 |
| 16 |
| 1 |
| 2 |
=
| 8 |
| 9 |
| 1 |
| 4 |
| 1 |
| 16 |
=
| 8 |
| 9 |
| 5 |
| 16 |
=
| 5 |
| 18 |
(2)(
| 3 |
| 8 |
| 1 |
| 12 |
=
| 3 |
| 8 |
| 1 |
| 12 |
=9+2,
=11;
(3)
| 7 |
| 12 |
| 1 |
| 9 |
| 5 |
| 12 |
=
| 7 |
| 12 |
| 1 |
| 9 |
| 1 |
| 9 |
| 5 |
| 12 |
=(
| 7 |
| 12 |
| 5 |
| 12 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
(4)
| 8 |
| 13 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 8 |
| 13 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 8 |
| 13 |
=
| 8 |
| 13 |
=
| 1 |
| 26 |
点评:四则混合运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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