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512×[(1−58)×56]19(2+0.5)×1.2−0.6÷275371×539+248000×0.371+2130×37.140.2×8.1×45÷(0.8×81×20.1)1990×1999-1989×2000363+411×362363×411−48.

题目详情
5
12
×[(1−
5
8
5
6
]
1
9
(2+0.5)×1.2−0.6÷
27
5

371×539+248000×0.371+2130×37.1
40.2×8.1×
4
5
÷(0.8×81×20.1)
1990×1999-1989×2000
363+411×362
363×411−48
▼优质解答
答案和解析
(1)
5
12
×[(1-
5
8
)×
5
6
]
=
5
12
×[
3
8
×
5
6
],
=
5
12
×
3
8
×
5
6

=
25
192


(2)
1
9
×(2+0.5)×1.2-0.6÷
27
5

=
1
9
×
5
2
×
6
5
-
3
5
×
5
27

=
1
3
-
1
9

=
2
9


(3)371×539+248000×0.371+2130×37.1,
=371×539+248×371+213×371,
=(539+248+213)×371,
=1000×371,
=371000;

(4)40.2×8.1×
4
5
÷(0.8×81×20.1)
=40.2×8.1×0.8÷0.8÷81÷20.1,,
=(40.2÷20.1)×(8.1÷81)×(0.8÷0.8),
=2×0.1×1,
=0.2;

(5)1990×1999-1989×2000,
=1990×(2000-1)-1989×2000,
=1990×2000-1990-1989×2000,
=2000×(1990-1989)-1990,
=2000-1990,
=10;

(6)
363+411×362
363×411−48

=
363+411×(363−1)
363×411−48

=
363+411×363−411
363×411−48

=
363×411−48
363×411−48

=1.