①-②得:(2x-3y)-(2x-8y)=5-3
5y=2,
故答案为:5y=2.
肱骨髁上骨折最常引起()
A.肱动脉损伤
B.桡动脉损伤
C.尺神经损伤
D.股骨转子骨折
E.旋股内、外动脉损伤
They have just cleaned the windows, so the room looks ______.[ ]
A. brightest
B. least bright
C. less bright
D. much brighter