一道除法题
问题描述:
一道除法题
2
--- + x =5
x-1
答
2/(x-1) +x =52/(x-1)=5-x(x-1)(5-x)=25x-x²-5+x=2-x²+6x=2+5各项乘以-1x²-6x=-7x²-6x+9=-7+9(x-3)²=2x-3=±√2x1=√2+3 x2=-√2+3经检验x1=√2+3 x2=-√2+3 是原方程的解....