题目内容
(2011?昆明模拟)
| 计算. 4÷
|
3.68-0.82-0.18 | 7.28-(1.28+0.25) | ||||||||||||||||||||||
(
|
(
|
[1-(
|
分析:(1)先算小括号里面的减法,再算括号外的除法,最后算乘法;
(2)(3)根据连续减去两个数等于减去这两个数的和简算;
(4)运用乘法分配律简算;
(5)先算括号里面的加法,再算括号外的除法,最后算加法;
(6)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
(2)(3)根据连续减去两个数等于减去这两个数的和简算;
(4)运用乘法分配律简算;
(5)先算括号里面的加法,再算括号外的除法,最后算加法;
(6)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
解答:解:(1)4÷
×(
-
),
=4÷
×
,
=8×
,
=3;
(2)3.68-0.82-0.18,
=3.68-(0.82+0.18),
=3.68-1,
=2.68;
(3)7.28-(1.28+0.25),
=7.28-1.28-0.25,
=6-0.25,
=5.75;
(4)(
-
+
)÷
,
=(
-
+
)×24,
=
×24-
×24+
×24,
=16-12+4,
=8;
(5)(
+
)÷
+
,
=
×
+
,
=
+
,
=
;
(6)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
.
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 4 |
=4÷
| 1 |
| 2 |
| 3 |
| 8 |
=8×
| 3 |
| 8 |
=3;
(2)3.68-0.82-0.18,
=3.68-(0.82+0.18),
=3.68-1,
=2.68;
(3)7.28-(1.28+0.25),
=7.28-1.28-0.25,
=6-0.25,
=5.75;
(4)(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 24 |
=(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=16-12+4,
=8;
(5)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
(6)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
点评:这类型的题目先观察算式,看能不能运用简便运算的方法简算,若不能就要按照运算顺序逐步运算.
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