脱式计算,能简算的要简算(219-135)×1.6÷(186×17) &...

2024-11-24 02:41:58
推荐回答(1个)
回答1:

(1)(2

1
9
-1
3
5
)×1.6÷(186×
1
7
)    
=
23
45
×1.6÷
186
7

=
184
225
÷
186
7

=
644
20925


(2)
9
10
×67.8+54.3÷1
1
9
-221×9%
=(67.8+54.3-22.1)×90%
=100×90%
=90;

(3)3333×3333+9999×8889+9
=9999×1111+9999×8889+9
=(1111+8889)×9999+9
=10000×9999+9
=99990000+9
=99990009;

(4)
2011×2011+2011
2012×2012?2012

=
(2011+1)×2011
(2012?1)×2012

=
2012×2011
2011×2012

=1.