... x2, x 3 ) = f (=120e 3 1, 2, 3 ). x11. x22. x 3 3 f(x1, x2, x 3 ) = f(0,0,0)x1x2x 3 + f(0,0,1)x1x2 x 3 + f(0,1,0)x1x2x 3 + f(0,1,1)x1 x2 x 3 + f(1,0,0) ... [1+x1+x2+x 3 ].[1+x1+x2+x 3 ].[1+x1+x2+x 3 ]. [1+x1+x2+x 3 ].[1+x1+x2+x 3 ] Hay: f(x1, x2, x 3 ) = x1 + x2.x 3 = [x1+x2+x 3 ].[x1+x2+x 3 ].[x1+x2+x 3 ] Váûy, dảng chênh tàõc ... x2, x 3 ) = x1 + x2.x 3 Viãút dỉåïi dảng chênh tàõc 2: f(x1, x2, x 3 ) = [0+x1+x2+x 3 ].[0+x1+x2+x 3 ].[0+x1+x2+x 3 ]. [1+x1+x2+x 3 ].[1+x1+x2+x 3 ].[1+x1+x2+x 3 ]....