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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

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

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һ˻˾ԪϰһһԪӦ273ôȥӶأ2Ԫϰģ߼ռλ

һ30ϰ3ǣǾ27 2725=2

ûʣµһǮ.ʵֻ27Ǯ.ϰ25Ԫ,Ա2Ԫ.һ27Ԫ.3Ԫ,ÿһԪ.

ѱݺͷԱһ壬˿һ10ԪݣϷԱ25+2=27Ԫ˸ÿ1Ԫÿ˷9Ԫ39=2727+3=30

Ŀң޷ȷ京塣 ṩԭĿƬ

1.-2x+3=10 -2x=10-3, -2x=7, x=-7/2 2.2/3x+1=-8 2/3x=-9, x=-9*3/2=-27/2 3.Xķmx^2-10X+3=0һ1/2m-1/mֵ m*(1/2)²-10*1/2 +3=0m/4=2, m=8, m-1/m=8-1/8=63/8 4.KΪֵʱXķ̣k+1X^2+k-1x+k=0 1)...

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