题目内容
计算下面各题
|
| ||||||||||||||
|
|
分析:(1)先计算小括号里面的加法,再计算中括号里面的减法,最后计算乘法;
(2)先计算乘法,再计算除法;
(3)先计算小括号里面的减法,再计算除法;
(4)先计算除法,再计算乘法.
(2)先计算乘法,再计算除法;
(3)先计算小括号里面的减法,再计算除法;
(4)先计算除法,再计算乘法.
解答:解:(1)
×[
-(
+
)],
=
×[
-
],
=
×
,
=
;
(2)
×
÷
,
=
÷
,
=
;
(3)
÷(3-
-
),
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
;
(4)
÷0.6×
,
=
×
,
=
.
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 2 |
=
| 4 |
| 9 |
| 1 |
| 3 |
=
| 4 |
| 27 |
(2)
| 35 |
| 64 |
| 3 |
| 7 |
| 3 |
| 8 |
=
| 15 |
| 64 |
| 3 |
| 8 |
=
| 5 |
| 8 |
(3)
| 2 |
| 5 |
| 3 |
| 11 |
| 8 |
| 11 |
=
| 2 |
| 5 |
| 3 |
| 11 |
| 8 |
| 11 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
=
| 1 |
| 5 |
(4)
| 18 |
| 35 |
| 2 |
| 3 |
=
| 6 |
| 7 |
| 2 |
| 3 |
=
| 4 |
| 7 |
点评:四则混合运算,先弄清运算顺序,然后再进行计算,能简算的要简算.
练习册系列答案
相关题目