题目内容
计算下面各题,能简算的要简算
×
+
÷
×[
+(
-
÷
)]
-0.35-1.65
(11-5)÷
×
.
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 6 |
| 7 |
| 16 |
| 5 |
| 16 |
| 9 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
| 17 |
| 8 |
(11-5)÷
| 5 |
| 6 |
| 6 |
| 13 |
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)先算小括号里面的除法,再算小括号里面的减法,再算中括号里面的加法,最后算括号外的乘法;
(3)根据连续减去两个数等于减去这两个数的和来简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算乘法.
(2)先算小括号里面的除法,再算小括号里面的减法,再算中括号里面的加法,最后算括号外的乘法;
(3)根据连续减去两个数等于减去这两个数的和来简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算乘法.
解答:解:(1)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)
×[
+(
-
÷
)],
=
×[
+(
-
)],
=
×[
+
-
],
=
×[
-
],
=
×
,
=
;
(3)
-0.35-1.65,
=
-(0.35+1.65),
=
-2,
=
;
(4)(11-5)÷
×
,
=6÷
×
,
=
×
,
=
.
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 6 |
=
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
| 6 |
| 5 |
=
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 6 |
| 5 |
=
| 6 |
| 5 |
(2)
| 7 |
| 16 |
| 5 |
| 16 |
| 9 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 7 |
| 16 |
| 5 |
| 16 |
| 9 |
| 16 |
| 1 |
| 2 |
=
| 7 |
| 16 |
| 5 |
| 16 |
| 9 |
| 16 |
| 1 |
| 2 |
=
| 7 |
| 16 |
| 7 |
| 8 |
| 1 |
| 2 |
=
| 7 |
| 16 |
| 3 |
| 8 |
=
| 21 |
| 128 |
(3)
| 17 |
| 8 |
=
| 17 |
| 8 |
=
| 17 |
| 8 |
=
| 1 |
| 8 |
(4)(11-5)÷
| 5 |
| 6 |
| 6 |
| 13 |
=6÷
| 5 |
| 6 |
| 6 |
| 13 |
=
| 36 |
| 5 |
| 6 |
| 13 |
=
| 216 |
| 65 |
点评:四则混合运算的顺序:1、如果是同一级运算,一般按从左往右依次进行计算;2、如果既有加减、又有乘除法,先算乘除法、再算加减; 3、如果有括号,先算括号里面的; 4、如果符合运算定律,可以利用运算定律进行简算
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