数学之美 1*8+1=9 12*8+2=98 123*8+3=987 1234*8+4=9876 12345*8+5=98765 123456*8+6=987654 1234567*8+7=9876543 12345678*8+8=98765432 123456789*8+9=987654321 1*9+2=11 12*9+3=111 123*9+4=1111 1234*9+5=11111 12345*9+6=111111 123456*9+7=1111111 1234567*9+8=11111111 12345678*9+9=111111111 123456789*9+10=1111111111 9*9+7=88 98*9+6=888 987*9+5=8888 9876*9+4=88888 98765*9+3=888888 987654*9+2=8888888 9876543*9+1=88888888 98765432*9+0=888888888 1*1=1 11*11=121 111*111=12321 1111*1111=1234321 11111*11111=123454321 111111*111111=12345654321 1111111*1111111=1234567654321 11111111*11111111=123456787654321 111111111*111111111=12345678987654321 |