2/x+(3/x+2)等于
问题描述:
2/x+(3/x+2)等于
答
2/x+3/(x+2)=12(x+2)+3x=x(x+2)2x+4+3x=x²+2xx²-3x-4=0(x-4)(x+1)=0x1=4 x2= -1
2/x+(3/x+2)等于
2/x+3/(x+2)=12(x+2)+3x=x(x+2)2x+4+3x=x²+2xx²-3x-4=0(x-4)(x+1)=0x1=4 x2= -1