(1)由题可知,BA平行且等于CO,所以设A(X1,Y),B(X2,Y),则M(0,Y),代入y=1/4x^2+1,且X1-X2=4,解得M(0,2)
(2)由题知,MC 平行于QP,向量MC=(4,2),向量QP=(x-t,y),所以有(x-t)/y=4/2,所以y=1/2(x-t)=x-t=1/4x^2+1,则t=-1/2x^2+x-2
(1)由题可知,BA平行且等于CO,所以设A(X1,Y),B(X2,Y),则M(0,Y),代入y=1/4x^2+1,且X1-X2=4,解得M(0,2)
(2)由题知,MC 平行于QP,向量MC=(4,2),向量QP=(x-t,y),所以有(x-t)/y=4/2,所以y=1/2(x-t)=x-t=1/4x^2+1,则t=-1/2x^2+x-2