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用你喜欢的方法计算352.5×55%+60.5×5.5+42.5×1120423×1019+419×9232003×2001200219×(225+319)×25.
题目详情
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 |
▼优质解答
答案和解析
(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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