第1个回答 2010-12-27
99×199+99+199
=199x(99+1) + 99
= 199x100 + 99
= 19900+99
= 19999
2)
67×9+99×3
= 67*9 + 9*11*3
= 9*67 +9 *33
= 9*(67+33)
= 9*100
= 900
3)
(632×5+632×2+632)×125
=(632*(5+2+1))*125
= 632* 8* 125
=632 * (8*125)
=632*1000
=632000
第2个回答 2010-12-27
99×199+99+199
=(99+1)(199+1)-1
=20000-1
=19999
67×9+99×3
=67×9+9×33
=9×100=900
(632×5+632×2+632)×125
=632×8×125
=632×1000
=632000
第3个回答 2010-12-27
99*199+99+199=99*(199+1)+199=99*200+199=19800+199=19999
67*9+99*3=67*(10-1)+(100-1)*3=670-67+300-3=(670+300)-(67+3)=970-70=900
(632*5+632+2+632)*125=632*(5+2+1)*125=632*8*125=632000 注意125*8=1000
第4个回答 2010-12-27
99×199+99+199
=99×(199+1)+199
=99×200+199
=19999
67×9+99×3
=67×9+9×11×3
=9×(67+33)
=9×100=900
(632×5+632×2+632)×125
=632×(5+2+1)×125
=632×8×125
=632×1000
=632000本回答被提问者采纳