\(M_o=f1=rxFF1=100i\ -120k+175k\)
\(f2=-200i+250j+100k\)
\(fr\ =-100i+130j+175k\)
\(r=4i+5j+3k\)
\(M_{o\ }=\left\{4i-100j5130k\right\}3175i\)
\(\left\{\left(5\text{*175}\right)-\left(130\text{*3}\right)\right\}=485i\ \ \ j\left(4\text{*175}\right)-\left\{3\text{*(-100)}\right\}=1000j\ \ k\left\{\left(4\text{*130}\right)-\left(100\text{*5}\right)\right\}\ =1020k\)
\(M_O\ =rx\ FF1=100i-120j+75k\ \ \ \ \ F2=200i+250j+100k\)
\(fr=-100i+130j+175k\)
\(r=4i+5j+3k\)
\(M_o=\left\{453-100i,\ 130j,175k\right\}=i\ \ \ \ \ \left\{\left(5\text{*175}\right)-\left(130\text{*3}\right)\right\}=485i\ \ \ \ \ j\left\{\left(4\text{*175}\right)3\text{*(-100)}\right\}=1000j\ \ \ k\ \left\{\left(4\text{*130}\right)-\left(5\text{*(-100)}\right)\right\}=1020k\)
\(M_o\ =485i-1000j+1020k\).