题目内容

怎样简便就怎样算
99999×22222+33333×33334 2003×2004÷2004×2004-2003×2004
2.8×(
1
7
+
3
28
101×
99
102
9.81×10%+0.5×98.1+0.049×981 23×
14
39
+14×
16
39
(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.
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