题目内容
计算下面各题:(能简便计算的要简便计算)
(1)88×(
|
(2)
|
(3)
| ||||||||||||||||||
(4)
|
(5)
|
(6)4-
|
分析:(1)(3)(5)运用乘法分配律简算;
(2)从左到右的顺序计算;
(4)先算小括号里面的减法,再算括号外的乘法;
(6)先算乘法,再算减法.
(2)从左到右的顺序计算;
(4)先算小括号里面的减法,再算括号外的乘法;
(6)先算乘法,再算减法.
解答:解:(1)88×(
+
),
=88×
+88×
,
=33+2,
=35;
(2)
×
×
,
=
×
,
=
;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
×(
-
),
=
×
,
=
;
(5)
×14+
=
×(14+1),
=
×15,
=14;
(6)4-
×
,
=4-
,
=2
.
| 3 |
| 8 |
| 1 |
| 44 |
=88×
| 3 |
| 8 |
| 1 |
| 44 |
=33+2,
=35;
(2)
| 10 |
| 21 |
| 12 |
| 25 |
| 7 |
| 8 |
=
| 8 |
| 35 |
| 7 |
| 8 |
=
| 1 |
| 5 |
(3)
| 23 |
| 25 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 25 |
=(
| 23 |
| 25 |
| 2 |
| 25 |
| 1 |
| 4 |
=1×
| 1 |
| 4 |
=
| 1 |
| 4 |
(4)
| 3 |
| 4 |
| 9 |
| 10 |
| 5 |
| 6 |
=
| 3 |
| 4 |
| 1 |
| 15 |
=
| 1 |
| 20 |
(5)
| 14 |
| 15 |
| 14 |
| 15 |
=
| 14 |
| 15 |
=
| 14 |
| 15 |
=14;
(6)4-
| 8 |
| 25 |
| 15 |
| 4 |
=4-
| 6 |
| 5 |
=2
| 4 |
| 5 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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