99.9×98+(1-4/5)×999
2个回答
解
99.9×98+(1-4/5)×999
=99.9×98+0.2×999
=99.9×98+2×99.9
=99.9×(98+2)
=99.9×100
=9990
相关问题
99.9×98+(0.8-3/5)×999,3/5是五分之三
用计算器计算(1)根号9×9+19;(2)根号99×99+199;(3)根号999×999+1999;(4)9999×9
√9×9+19;√99×99+199; √999×999+1999 √9999×9999+19999;
9×9=99×99=999×999=9999×9999=99999×99999=我能直接想出:999999999×999
已知A=1/2*3/4*5/6……*97/98*99/100,B=2/3×4/5×6/7×8/9×.×98/99和1/1
99×99+98×98怎样简算99×99-98×98
99×9=891,999×9=8991,9999×9=______,999999×9=______.
简便计算:99.9×999+99.9
1/2×2/3×3/4×4/5×…×97/98×98/99 你发现了什么?
1/1×2+1/2×3+1/3×4+1/4×5+……+1/98×99+1/99×100=()简算