定义两种运算“0”和“?”,对于任意两个整数A、B,已知A0B=A+B-1,B=A×B-1.若x0(x?4)=30,则x=()

问题描述:

定义两种运算“0”和“?”,对于任意两个整数A、B,已知A0B=A+B-1,B=A×B-1.若x0(x?4)=30,则x=()

X0(X?4)=30由此可得X0(4X-1)=X+(4X-1)-1=30,X=32/5=6.4

X0(X?4)=30
X0(4x-1)=30
x04x-x01=30
5x-1-x-1+1=30
4x-1=30
4x=31
x=4/31