99.9+999×9.9(巧算) =
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99.9+999×9.9(巧算)=99.9+999×9.9(巧算)=99.9+999×9.9(巧算)=99.9+999x9.9=99.9x(9.9+0.1)=99.9x10=999
99.9+999×9.9(巧算) =
99.9+999×9.9(巧算) =
99.9+999×9.9(巧算) =
99.9+999x9.9=99.9x(9.9+0.1)=99.9x10=999
99.9+999×9.9(巧算) =
99.9 ×9.9(巧算) (12.5+2.5)×0.8(巧算)急死人.
1999+999*999=?(巧算)
9.9+99.9+199.9=
简便计算99.9+999×9.9
0.9+9.9+99.9+999.9 =
99.9*99.9+19.99巧算
99.9+9.9+0.9+0.3===
9.9+99.9+999.9+9999.9+1=?简算
999.9+99.9+9.9+0.9=?简便方法
0.9+9.9+99.9+999.9+9999.9=?要简算
999.9+99.9+9.9+0.9=简便运算
67*99.9+9.9*333(用巧算)
9.9+99.9+999.9+0.3我今晚就要,还有:1.25*0.25*32=( )
99×99.9+9.9简算
9.9加99.9 简算
9.9+99.9+999.9
0.9+9.9+99.9+999.9