题目内容
| 下面各题怎样简便怎样算. 6.13+28.86+13.87+1.14 | 12×97+1.2×30 | 71÷60-68×
| ||||||||||||
| 8.8×(3.75-1.25)×1.25 | (
| (
|
(1)6.13+28.86+13.87+1.14,
=(6.13+13.87)+(28.86+1.14),
=20+30,
=50;
(2)12×97+1.2×30,
=12×(97+3),
=12×100,
=1200;
(3)71÷60-68×
,
=(71-68)×
,
=3×
,
=0.05;
(4)8.8×(3.75-1.25)×1.25,
=[(8+0.8)×1.25]×2.5,
=[8×1.25+0.8×1.25]×2.5,
=[10+1]×2.5,
=10×2.5+1×2.5,
=25+2.5,
=27.5;
(5)(
+
×
)÷
,
=(
+
)÷
,
=
×
+
×
,
=
+
,
=1;
(6)(
-
)×9×41,
=
×9×41-
×9×41,
=4×41-2×9,
=164-18,
=146.
=(6.13+13.87)+(28.86+1.14),
=20+30,
=50;
(2)12×97+1.2×30,
=12×(97+3),
=12×100,
=1200;
(3)71÷60-68×
| 1 |
| 60 |
=(71-68)×
| 1 |
| 60 |
=3×
| 1 |
| 60 |
=0.05;
(4)8.8×(3.75-1.25)×1.25,
=[(8+0.8)×1.25]×2.5,
=[8×1.25+0.8×1.25]×2.5,
=[10+1]×2.5,
=10×2.5+1×2.5,
=25+2.5,
=27.5;
(5)(
| 3 |
| 4 |
| 8 |
| 15 |
| 5 |
| 12 |
| 35 |
| 36 |
=(
| 3 |
| 4 |
| 2 |
| 9 |
| 35 |
| 36 |
=
| 3 |
| 4 |
| 36 |
| 35 |
| 2 |
| 9 |
| 36 |
| 35 |
=
| 27 |
| 35 |
| 8 |
| 35 |
=1;
(6)(
| 4 |
| 9 |
| 2 |
| 41 |
=
| 4 |
| 9 |
| 2 |
| 41 |
=4×41-2×9,
=164-18,
=146.
练习册系列答案
相关题目