a☆b=a+b-1,
a○b=a*b-1
4○【(16☆8)☆(3☆5)】的值
16☆8=18+6-1=33 3☆5=3+5-1=7
(16☆8)☆(3☆5)=33☆7=33+7-1=39
4○【(16☆8)☆(3☆5)】=4○39=4*39-1=155
X☆(X○4)=30
X○4=4x-1
X☆(X○4)=x☆(4x-1)=x+4x-1-1=5x-2=30
x=6.4
a☆b=a+b-1,
a○b=a*b-1
4○【(16☆8)☆(3☆5)】的值
16☆8=18+6-1=33 3☆5=3+5-1=7
(16☆8)☆(3☆5)=33☆7=33+7-1=39
4○【(16☆8)☆(3☆5)】=4○39=4*39-1=155
X☆(X○4)=30
X○4=4x-1
X☆(X○4)=x☆(4x-1)=x+4x-1-1=5x-2=30
x=6.4