若9*2=9+8,5*4=5+4+3+2.那么在x*10=205中,x=_.

问题描述:

若9*2=9+8,5*4=5+4+3+2.那么在x*10=205中,x=______.

x*10=205,
x+x-1+x-2+x-3+x-4+x-5+x-6+x-7+x-8+x-9=205,
                               10x-45=205,
                                  10x=205+45,
                                  10x=250,
                                    x=25,
故答案为:25.