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

题目简介

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

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
题型:解答题难度:中档来源:不详

答案

(1)class="stub"5
12
×[(1-class="stub"5
8
)×class="stub"5
6
]
=class="stub"5
12
×[class="stub"3
8
×class="stub"5
6
],
=class="stub"5
12
×class="stub"3
8
×class="stub"5
6

=class="stub"25
192


(2)class="stub"1
9
×(2+0.5)×1.2-0.6÷class="stub"27
5

=class="stub"1
9
×class="stub"5
2
×class="stub"6
5
-class="stub"3
5
×class="stub"5
27

=class="stub"1
3
-class="stub"1
9

=class="stub"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×class="stub"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)class="stub"363+411×362
363×411-48

=
363+411×(363-1)
363×411-48

=class="stub"363+411×363-411
363×411-48

=class="stub"363×411-48
363×411-48

=1.

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