-2*-2*-2*-2-(3/4+5/6)*[-60+3*(-2*-2)]
=(-2)^4-19/12*(-60+12)
=16-19/12*(-48)
=16+76
=92
-4ab-2(5a-3)+2a(3-b)
=-4ab-10a+6+6a-2ab
=-6ab-4a+6
|M-3| /(N+2*N+2)=0 ---> M=3,N算不出
---->3/2(M-N)=3/2(3-N)
角AOC≠角BOD吗
甲:∠BOC=360-∠BOD-∠DOC=360-150-90=120
乙:∠BOC=∠BOD-∠DOC=150-90=60