He did finally come with us, although it took a long time to ____(说服) him.
57×4×5=____
已知△ABC中,AD是∠BAC的平分线,AD的垂直平分线交BC的延长线于F.
求证:∠BAF=∠ACF.
已知△ABC中,D、E分别是AB、AC的中点,则S△ADE:S△ABC= ____