题目内容
用你喜欢的方法计算下列各题
| ①6.2×8.5+3.8×8.5 | ②24×(
| ||||||||||||||||
③[
|
④
|
分析:(1)根据乘法分配律进行计算.
(2)根据乘法分配律进行计算.
(3)先算小括号里面的,再算把除法转化为乘法运用乘法分配律计算,
(4)先算小括号里面的,再算中括号,最后算除法.
(2)根据乘法分配律进行计算.
(3)先算小括号里面的,再算把除法转化为乘法运用乘法分配律计算,
(4)先算小括号里面的,再算中括号,最后算除法.
解答:解:(1)6.2×8.5+3.8×8.5,
=(6.2+3.8)×8.5,
=10×8.5,
=85;
(2)24×(
+
-
),
=24×
+24×
-24×
,
=8+4-6,
=6;
(3)[
-(
+
)]÷
,
=[
-
]÷
,
=[
-
]×
,
=
×
-
×
,
=
-
,
=
;
(4)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=
.
=(6.2+3.8)×8.5,
=10×8.5,
=85;
(2)24×(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
=24×
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
=8+4-6,
=6;
(3)[
| 7 |
| 8 |
| 4 |
| 15 |
| 7 |
| 12 |
| 5 |
| 16 |
=[
| 7 |
| 8 |
| 51 |
| 60 |
| 5 |
| 16 |
=[
| 7 |
| 8 |
| 51 |
| 60 |
| 16 |
| 5 |
=
| 7 |
| 8 |
| 16 |
| 5 |
| 51 |
| 60 |
| 16 |
| 5 |
=
| 14 |
| 5 |
| 204 |
| 75 |
=
| 2 |
| 25 |
(4)
| 7 |
| 8 |
| 9 |
| 14 |
| 5 |
| 6 |
| 4 |
| 9 |
=
| 7 |
| 8 |
| 9 |
| 14 |
| 7 |
| 18 |
=
| 7 |
| 8 |
| 1 |
| 4 |
=
| 7 |
| 2 |
点评:本题主要考查了学生在计算中灵活运用简便算法,进行计算的能力,注意要细心.
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