题目内容
| 计算下面各题,能简算的要简算. (
|
(
|
1.25×98×8 | ||||||||||||||||||
[(1
|
|
1.8×
|
分析:①④根据四则混合运算的运算顺序计算即可.
②⑤⑥运用乘法的分配律进行计算即可.
③运用乘法的结合律、交换律进行计算.
②⑤⑥运用乘法的分配律进行计算即可.
③运用乘法的结合律、交换律进行计算.
解答:解:①(
+
)÷
=
×
=2
②(
+
)×48
=48×
+
×48
=21+26
=47
③1.25×98×8
=(1.25×8)×98
=10×98
=980
④[(1
-1)÷
]×
=[
÷
]×
=
×
×
=
⑤
÷23+
×
=
×
+
×
=
×(
+
)
=
×1
=
⑥1.8×
+1.2×
-
=
×(1.8+1.2-1)
=
×2
=1.5
| 1 |
| 4 |
| 2 |
| 3 |
| 11 |
| 24 |
=
| 11 |
| 12 |
| 24 |
| 11 |
=2
②(
| 7 |
| 16 |
| 13 |
| 24 |
=48×
| 7 |
| 16 |
| 13 |
| 24 |
=21+26
=47
③1.25×98×8
=(1.25×8)×98
=10×98
=980
④[(1
| 2 |
| 5 |
| 3 |
| 5 |
| 5 |
| 4 |
=[
| 2 |
| 5 |
| 3 |
| 5 |
| 5 |
| 4 |
=
| 2 |
| 5 |
| 5 |
| 3 |
| 5 |
| 4 |
=
| 5 |
| 6 |
⑤
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 1 |
| 23 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 1 |
| 23 |
=
| 1 |
| 23 |
⑥1.8×
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=1.5
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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