题目内容
计算下面各题.(能简算的要简算)
|
6.5÷12.5%+3.5×8 | ||||||||||||
| 4.8×1.01 | 2-
| ||||||||||||
(
|
(
|
分析:(1)可根据乘法分配律计算.
(2)可将式中除法算式变为乘法算式后,根据乘法分配律计算.
(3)可将1.01变为1+0.01后根据乘法分配律计算.
(4)先算除算,再算减法.
(5)先算括号中的乘法,再算加法,最后算括号外的乘法.
(6)可根据乘法分配律计算.
(2)可将式中除法算式变为乘法算式后,根据乘法分配律计算.
(3)可将1.01变为1+0.01后根据乘法分配律计算.
(4)先算除算,再算减法.
(5)先算括号中的乘法,再算加法,最后算括号外的乘法.
(6)可根据乘法分配律计算.
解答:解:(1)
×5.3-
+3.7×
=(5.3-1+3.7)×
=8×
=1;
(2)6.5÷12.5%+3.5×8
=6.5×8+3.5×8
=(6.5+3.5)×8
=10×8
=80;
(3)4.8×1.01
=4.8×(1+0.01)
=4.8×1+4.8×0.01
=4.8+0.048
=4.8048;
(4)2-
÷
÷
=2-
×
×
=2-1
=
;
(5)(
+
×
)×
=(
+
)×
=
×
=
;
(6)(
+
)×36
=
×36+
×36
=22+21
=43.
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=(5.3-1+3.7)×
| 1 |
| 8 |
=8×
| 1 |
| 8 |
=1;
(2)6.5÷12.5%+3.5×8
=6.5×8+3.5×8
=(6.5+3.5)×8
=10×8
=80;
(3)4.8×1.01
=4.8×(1+0.01)
=4.8×1+4.8×0.01
=4.8+0.048
=4.8048;
(4)2-
| 15 |
| 16 |
| 5 |
| 7 |
| 3 |
| 4 |
=2-
| 15 |
| 16 |
| 7 |
| 5 |
| 4 |
| 3 |
=2-1
| 3 |
| 4 |
=
| 1 |
| 4 |
(5)(
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 6 |
| 2 |
| 3 |
=(
| 3 |
| 4 |
| 5 |
| 24 |
| 2 |
| 3 |
=
| 23 |
| 24 |
| 2 |
| 3 |
=
| 23 |
| 36 |
(6)(
| 11 |
| 18 |
| 7 |
| 12 |
=
| 11 |
| 18 |
| 7 |
| 12 |
=22+21
=43.
点评:完成此类题目要注意分析式中数据的特点,然后运用合适的方法计算.
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