若2x-3

问题描述:

若2x-3

解:✓(x^2-3x+9/4)
=✓(x-3/2)^2
x✓(x-3/2)^2
=3/2-x

根号x²-3x+4分之9
=√(x-3/2)²
=|x-3/2|
∵2x-3