x平面∑MA(F)=0Mx-=0 Mr=2=2825 2×12848N.my 2 =181481N. y平面∑MA(F)=022-LRB=0 4677 ∑z=0-R4p+F-Rgy=0 RA=F-RBy=4677-233.85M=233.85N 平面∑M()=0.-2+Nm=0 E21284.8 N=642.4N 22 ∑=0-RA+F-RB=0 RAF=E1-RB=1284.8-6424M=642.4N