— What do you think of tomorrow's football match? — _______ difficult for us _______ the match.
读一读,写一写。
shū jí
chōu ti
kǒng bù
mó guǐ
____
设复数z1,z2在复平面内的对应点关于实轴对称,z1=1+i,则z1z2=( )