1/2│x-2y│= -2│x-4│化简为
|x-2y| = -4 |x-4|
|x-2y| = - |4x-16|
所以
|x-2y| = 0 ,-|4x-16| = 0
所以
x-2y = 0 ,x = 2y
4x-16 = 0 ,x = 4
所以
y = 2
所以 4x∧2-3y =16开3次根号= 2*2开3次根号