例:2.1×9=18.9;3.21×9=28.89;4.321×9=38.889;5.4321×9=48.8889.求6
1个回答
58.88889
68.888889
相关问题
2.1×9= ()×9 3.21×9= ()×9= 4.321×9= .
38.9²-2×38.9×48.9+48.9²=;24²+34×32+16²;
8×5+4= 4×9÷6= 72÷8×3= 49÷9÷9= 18÷(47-38) 48÷6×5=
(21.2×6.9+21.2×3+6.9×3)×2=?
观察下列各式:①9×0+1=1;②9×1+2=11;③9×2+3=21;④______;⑤9×4+5=41;….
45+13= 7×6= 45-18= 81-21= 9×5= 5×9= 56-29= 6×7= 34+18= 7×9=
口算6×5= 8×9= 24-8= 6×9= 7+9= 7×7= 4×8= 38+7= 4×9= 56+6= 91-40
直接写出得数. 14×[5/21]= [1/2]+[1/3]= [7/9]×18= [1/7]-[1/9]= 4.9×1
9×0+1=1 9×1+2=11 9×2+3=21.9 9×3+4=31 9×4+5=41…… 猜想第n个等式(n为正整
4×7= 42÷6= 48÷8= 21÷3= 6×5= 8×5= 8×8= 9÷9= 54÷9= 72÷9= 36÷4=