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(2011•龙湖区)计算下面各题.(能简便的要简便)260÷(38+27)+456453-199814.28÷3.5÷249×1516÷56102×7.878÷[1÷(710-720)].
题目详情
(2011•龙湖区)
计算下面各题.(能简便的要简便) 260÷(38+27)+45 | 6453-1998 | 14.28÷3.5÷2 | ||||||||||||
| 102×7.8 |
|
▼优质解答
答案和解析
(1)260÷(38+27)+45
=260÷65+45,
=4+45,
=49;
(2)6453-1998
=6453-2000+2,
=4453+2,
=4455;
(3)14.28÷3.5÷2
=14.28÷(3.5×2),
=14.28÷7,
=2.04,
(4)
×
÷
=
×
,
=
;
(5)102×7.8
=(100+2)×7.8,
=100×7.8+7.8×2,
=780+15.6,
=795.6;
(6)
÷[1÷(
-
)].
=
÷[1÷
],
=
÷
,
=
.
=260÷65+45,
=4+45,
=49;
(2)6453-1998
=6453-2000+2,
=4453+2,
=4455;
(3)14.28÷3.5÷2
=14.28÷(3.5×2),
=14.28÷7,
=2.04,
(4)
4 |
9 |
15 |
16 |
5 |
6 |
=
5 |
12 |
6 |
5 |
=
1 |
2 |
(5)102×7.8
=(100+2)×7.8,
=100×7.8+7.8×2,
=780+15.6,
=795.6;
(6)
7 |
8 |
7 |
10 |
7 |
20 |
=
7 |
8 |
7 |
20 |
=
7 |
8 |
20 |
7 |
=
49 |
160 |
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