问题 解答题
怎样简便就怎样算
99999×22222+33333×333342003×2004÷2004×2004-2003×2004
2.8×(
1
7
+
3
28
101×
99
102
9.81×10%+0.5×98.1+0.049×98123×
14
39
+14×
16
39
答案

(1)99999×22222+33333×33334,

=33333×3×22222+33333×33334,

=33333×(66666+33334)

=33333×100000,

=3333300000;

(2)2003×2004÷2004×2004-2003×2004,

=2003×2004-2003×2004,

=0;

(3)2.8×(

1
7
+
3
28
),

=2.8×

1
7
+2.8×
3
28

=0.4+0.3,

=0.7;

(4)101×

99
102

=(102-1)×

99
102

=102×

99
102
-1×
99
102

=99-

99
102

=98

1
34

(5)9.81×10%+0.5×98.1+0.049×981,

=9.81×0.1+5×9.81+4.9×9.81,

=9.81×(0.1+5+4.9),

=9.81×10,

=98.1;

(6)23×

14
39
+14×
16
39

=23×

14
39
+16×
14
39

=(23+16)×

14
39

=39×

14
39

=14.

单项选择题
单项选择题