题目内容
计算﹙用你喜欢的方法﹚
| 0.25×1.25×320 | 19.98×37-199.8×1.9+1998×0.82 | ﹙
| ||||||||||||||||||||||||||||
[1-﹙
| [
| 20-[﹙
|
|
(1)
÷5+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(2)0.25×1.25×320,
=0.25×1.25×(40×8),
=(0.25×40)×(1.25×8),
=10×10,
=100;
(3)19.98×37-199.8×1.9+1998×0.82,
=1998×0.37-1998×0.19+1998×0.82,
=1998×(0.37-0.19+0.82),
=1998×1,
=1998;
(4)﹙
-
+
﹚×12,
=
×12-
×12+
×12,
=2-3+4,
=3;
(5)[1-﹙
+
﹚]÷
,
=[1-
]÷
,
=
÷
,
=
;
(6)[
+0÷﹙
+
﹚]×
,
=[
+0]×
,
=
×
,
=
;
(7)20-[﹙
+
﹚÷
]×1.2,
=20-[
÷
]×1.2,
=20-1×1.2,
=20-1.2,
=18.8;
(8)
×[15×﹙
-
﹚+
],
=
×[15×
+
],
=
×[
+
],
=
×
,
=
.
| 5 |
| 18 |
| 1 |
| 18 |
| 1 |
| 5 |
=
| 5 |
| 18 |
| 1 |
| 5 |
| 1 |
| 18 |
| 1 |
| 5 |
=(
| 5 |
| 18 |
| 1 |
| 18 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 15 |
(2)0.25×1.25×320,
=0.25×1.25×(40×8),
=(0.25×40)×(1.25×8),
=10×10,
=100;
(3)19.98×37-199.8×1.9+1998×0.82,
=1998×0.37-1998×0.19+1998×0.82,
=1998×(0.37-0.19+0.82),
=1998×1,
=1998;
(4)﹙
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=2-3+4,
=3;
(5)[1-﹙
| 1 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
=[1-
| 5 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 3 |
| 4 |
=
| 1 |
| 2 |
(6)[
| 9 |
| 16 |
| 1 |
| 7 |
| 7 |
| 8 |
| 4 |
| 3 |
=[
| 9 |
| 16 |
| 4 |
| 3 |
=
| 9 |
| 16 |
| 4 |
| 3 |
=
| 3 |
| 4 |
(7)20-[﹙
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=20-[
| 5 |
| 6 |
| 5 |
| 6 |
=20-1×1.2,
=20-1.2,
=18.8;
(8)
| 4 |
| 7 |
| 1 |
| 3 |
| 3 |
| 10 |
| 7 |
| 8 |
=
| 4 |
| 7 |
| 1 |
| 30 |
| 7 |
| 8 |
=
| 4 |
| 7 |
| 1 |
| 2 |
| 7 |
| 8 |
=
| 4 |
| 7 |
| 11 |
| 8 |
=
| 11 |
| 14 |
练习册系列答案
相关题目