题目内容
| 用自已喜欢的方法计算. ①2450-450÷18×25 | ②
| ③3618÷45-0.2 | ||||||||||
④4-
| ⑤
| ⑥2.9÷8+1.1×
|
①2450-450÷18×25
=2450-25×25,
=2450-625,
=1825;
②
+
+
+
=(
+
)+(
+
),
=1+
,
=1
;
③3618÷45-0.2
=80.4-0.2,
=80.2;
④4-
÷4-
=4-
-
,
=4-(
+
),
=4-1,
=3;
⑤
×8×
×1.25
=(
×
)×(8×1.25),
=
×10,
=16;
⑥2.9÷8+1.1×
=2.9×
+1.1×
,
=(2.9+1.1)×
,
=4×
,
=
.
=2450-25×25,
=2450-625,
=1825;
②
| 7 |
| 11 |
| 1 |
| 5 |
| 4 |
| 11 |
| 3 |
| 5 |
=(
| 7 |
| 11 |
| 4 |
| 11 |
| 1 |
| 5 |
| 3 |
| 5 |
=1+
| 4 |
| 5 |
=1
| 4 |
| 5 |
③3618÷45-0.2
=80.4-0.2,
=80.2;
④4-
| 4 |
| 5 |
| 4 |
| 5 |
=4-
| 1 |
| 5 |
| 4 |
| 5 |
=4-(
| 1 |
| 5 |
| 4 |
| 5 |
=4-1,
=3;
⑤
| 13 |
| 5 |
| 8 |
| 13 |
=(
| 13 |
| 5 |
| 8 |
| 13 |
=
| 8 |
| 5 |
=16;
⑥2.9÷8+1.1×
| 1 |
| 8 |
=2.9×
| 1 |
| 8 |
| 1 |
| 8 |
=(2.9+1.1)×
| 1 |
| 8 |
=4×
| 1 |
| 8 |
=
| 1 |
| 2 |
练习册系列答案
相关题目