a加1分之b减2.等於4.求代數式4(a加1)分之3(b减2)加b减2分之3(a加1)

a加1分之b减2.等於4.求代數式4(a加1)分之3(b减2)加b减2分之3(a加1)

(b-2)/(a+1)=4
b-2=4(a+1)
4(a加1)分之3(b减2)加b减2分之3(a加1)
=3×4(a+1)/4(a+1)+ 3(a+1)/4(a+1)
=3+3/4
=3又4分之3