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91ʮ92ʮ93ʮ94ʮ95ʮ96ʮ97ʮ98ʮ99ü㷽...

[91+99]+[92+98]+[93+97]+[94+96]+95 ˰ֿͼ

91+99+92+98+93+97+94+96+95+90=190+190+190+190+185=190*5-5=950-5=945

93ʮ96ʮ97ʮ95ʮ89ʮ90ʮ94ʮ87ʮ95ʮ92 =90*10+3+6+7+51+43+5+2=928

89ʮ94ʮ92ʮ93ʮ94ʮ96ʮ87=(90-1)+(90+4)+(90+2)+(90+3)+(90+4)+(90+6)+(90-3)=90x7+(4+2+3+4+6-1-3)=630+15=645

90+91+92+93+94+95+96+97+98+99 =(90+99)+(91+98)+(03+97)+(93+96)+(94+95) =185*5 =945

91+92+93+94+95+96+97+98+99 =100*9-(1+9)-(2+8)-(3+7)-(4+6)-5=855

(90+99)*10/2=945

:ÿһֶȥ95,-4,2,-1,1,0,-2,0,5,-3,4,-2,-6⼸ֵƽ-0.5ƽ95-0.5=94.5лл!

1009998979695949392Ӽ4321=100-98+99-97+96-94+95-94++4-2+3-1=2+2+2++2=2*50=100

100 * 10 - (1+2+3+4+5+6+7+8+9+10)= 1000 - 55= 945

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