Question

2x-1/2x+x/x+2=1 求解, x+1/2（x-1）+x-1/6（x+1)=7 求解

Answer 1

(2x-1)(x+2)+2x^2=2x^2+4x

4x^2+3x-2=4x

2x^2-x-2=0

△=1+16=17

x=(1±✓17)／4

3(x+1)^2-(x-1)^2=42(x+1)(x-1)

3x^2+6x+3-x^2+2x-1=42x^2-4x

40x^2-8x-40=0

5x^2-x-5=0

△=1+100=101

x=(1±✓101)／10