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ǰλãҳ >> 1X9=10һ1=9,2X9=20һ2=18,3X9=30һ3=27,... >>

1X9=10һ1=9,2X9=20һ2=18,3X9=30һ3=27,...

60-6=54

3(xһ7)һ2(9һ3x)=18 3x-21-18+6x=18 9x-39=18 9x=39+18 9x=57 x=19/3

1x9=9=10-1 2x9=18=20-2 3x9=27=30-3 4x9=36=40-4......ʮȥ9˵

1289=128x9+(128+9) ô⣺ abc9=abc x 10 + 9 = abc x (9+1) +9 = abc x 9 + (abc+9) a b c ֱΪ19 ȻλԸࡣ

Ŀң޷ȷ京塣 ṩԭĿƬ

ڵij˻1мǸżƽ 2N-1ƽX2N+1)ƽ+1=2Nƽ

3x+9=27 3x+9-9=27-9 3x=18 x=6

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׶԰ĿȦȦ

ûʣµһǮ.ʵֻ27Ǯ.ϰ25Ԫ,Ա2Ԫ.һ27Ԫ.3Ԫ,ÿһԪ.

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