a-b=3(a-b)²=9a²-2ab+b²=95-2ab=92ab=-4(a+b)²=a²+2ab+b²=5-4=1x+1/x=3(x+1/x)²=9x²+2+1/x²=9x²+1/x²=7(x²+1/x²)²=49x^4+2+1/x^4=49x^4+1/x...已知x≠0，且x+x分之1=3，求x²+x²分之1，x四方+x四方分之1的值x+1/x=3(x+1/x)²=9x²+2+1/x²=9x²+1/x²=7(x²+1/x²)²=49x^4+2+1/x^4=49x^4+1/x^4=47