题目内容
用你喜欢的方法计算
352.5×55%+60.5×5.5+42.5×
×
+
×
2003×
19×(
+
)×25.
352.5×55%+60.5×5.5+42.5×
| 11 |
| 20 |
| 4 |
| 23 |
| 10 |
| 19 |
| 4 |
| 19 |
| 9 |
| 23 |
2003×
| 2001 |
| 2002 |
| 2 |
| 25 |
| 3 |
| 19 |
(1)352.5×55%+60.5×5.5+42.5×
=352.5×0.55+60.5×5.5+42.5×0.55,
=(352.5+42.5)×0.55+60.5×5.5,
=395×0.55+605×0.55,
=(395+605)×0.55,
=1000×0.55,
=550;
(2)
×
+
×
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)2003×
=(2002+1)×
,
=2002×
+
×1,
=2001+
,
=2001
;
(3)19×(
+
)×25,
=
×25×19+
×19×25,
=38+75,
=113.
| 11 |
| 20 |
=352.5×0.55+60.5×5.5+42.5×0.55,
=(352.5+42.5)×0.55+60.5×5.5,
=395×0.55+605×0.55,
=(395+605)×0.55,
=1000×0.55,
=550;
(2)
| 4 |
| 23 |
| 10 |
| 19 |
| 4 |
| 19 |
| 9 |
| 23 |
=
| 10 |
| 23 |
| 4 |
| 19 |
| 4 |
| 19 |
| 9 |
| 23 |
=(
| 10 |
| 23 |
| 9 |
| 23 |
| 4 |
| 19 |
=
| 19 |
| 23 |
| 4 |
| 19 |
=
| 4 |
| 23 |
(3)2003×
| 2001 |
| 2002 |
=(2002+1)×
| 2001 |
| 2002 |
=2002×
| 2001 |
| 2002 |
| 2001 |
| 2002 |
=2001+
| 2001 |
| 2002 |
=2001
| 2001 |
| 2002 |
(3)19×(
| 2 |
| 25 |
| 3 |
| 19 |
=
| 2 |
| 25 |
| 3 |
| 19 |
=38+75,
=113.
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