题目内容
| 用你喜欢的方法计算 (1)(
| (2)(1-
| (3)25×1.25×32 | ||||||||||
(4)175×
| (5)187.7×11-187.7 | (6)19÷[(
|
(1)(
+
)×15×17,
=(
+
)×(15×17),
=
×15×17+
×15×17,
=17+30,
=47.
(2)(1-
)×
÷3,
=
×
×
,
=
;
(3)25×1.25×32
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;
(4)175×
+
×175,
=(
+
)×175,
=1×175,
=175;
(5)187.7×11-187.7,
=187.7×(11-1),
=187.7×10,
=1877.
(6)19÷[(
+
)÷
],
=19÷[(
+
)÷
],
=19÷[
×2],
=19÷
,
=19×
,
=10.
| 1 |
| 15 |
| 2 |
| 17 |
=(
| 1 |
| 15 |
| 2 |
| 17 |
=
| 1 |
| 15 |
| 2 |
| 17 |
=17+30,
=47.
(2)(1-
| 17 |
| 20 |
| 3 |
| 8 |
=
| 3 |
| 20 |
| 3 |
| 8 |
| 1 |
| 3 |
=
| 3 |
| 160 |
(3)25×1.25×32
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;
(4)175×
| 3 |
| 10 |
| 7 |
| 10 |
=(
| 3 |
| 10 |
| 7 |
| 10 |
=1×175,
=175;
(5)187.7×11-187.7,
=187.7×(11-1),
=187.7×10,
=1877.
(6)19÷[(
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
=19÷[(
| 15 |
| 20 |
| 4 |
| 20 |
| 1 |
| 2 |
=19÷[
| 19 |
| 20 |
=19÷
| 19 |
| 10 |
=19×
| 10 |
| 19 |
=10.
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