Question

【数学化简求值】（x-2）×（x²-4）分之2x+（x+2）分之4

Answer 1

=(x-2)×2x/(x+2)(x-2)+4/(x+2)

=2x/(x+2)+4/(x+2)

=(2x+4)/(x+2)

=2

2、(x-1-1)/(x-1) ×(x-1)²/(x+2)(x-2)

=(x-2)/(x-1) ×(x-1)²/(x+2)(x-2)

=(x-1)/(x+2)

3 、两边乘以(x-2)得

3-1=x-2

x=4

检验：x=4是方程的解

4、两边乘以(x+2)(x-2)得

x²-4x+4=x²-4-4

-4x=-12

x=3

检验：x=3是方程的解