y' = xy x − y2 > ham dieukien nghiem plot(nghiem, type = "l", which = "y",lwd = 2, xlab = "Truc x", ylab = "Truc y",main = "PTVP") 2.00 2.02 2.04 2.06 Truc y 2.08 2.10 2.12 PTVP 166 168 170 172 Truc x y '+ y = x 174 176 > ham dieukien nghiem plot(nghiem, type = "l", which = "y",lwd = 2, xlab = "Truc x", ylab = "Truc y",main = "PTVP") 100 200 300 Truc y 400 500 600 700 PTVP 166 168 170 172 174 Truc x y '+2 xy = xe − x > ham dieukien nghiem plot(nghiem, type = "l", which = "y",lwd = 2, xlab = "Truc x", ylab = "Truc y",main = "PTVP") 0.0 0.5 1.0 Truc y 1.5 2.0 PTVP 166 168 170 172 174 176 Truc x y '− y sin x = sin x cos x > ham dieukien nghiem plot(nghiem, type = "l", which = "y",lwd = 2, xlab = "Truc x", ylab = "Truc y",main = "PTVP") 0.0 0.5 1.0 Truc y 1.5 2.0 PTVP 166 168 170 172 174 Truc x y '+ xy = arcsin x + x 1− x2 > ham dieukien nghiem warnings() Warning messages: 176 1: In asin(x) : NaNs produced 2: In asin(x) : NaNs produced 3: In asin(x) : NaNs produced 4: In asin(x) : NaNs produced 5: In asin(x) : NaNs produced 6: In asin(x) : NaNs produced 7: In asin(x) : NaNs produced 8: In asin(x) : NaNs produced 9: In asin(x) : NaNs produced 10: In asin(x) : NaNs produced 11: In asin(x) : NaNs produced 12: In asin(x) : NaNs produced 13: In asin(x) : NaNs produced 14: In asin(x) : NaNs produced y ' = x( x + y ) > ham dieukien nghiem ham dieukien nghiem warnings() Warning messages: 176 1: In sqrt(1 - x^2) : NaNs produced 2: In asin(x) : NaNs produced 3: In sqrt(1 - x^2) : NaNs produced 4: In sqrt(1 - x^2) : NaNs produced 5: In asin(x) : NaNs produced 6: In sqrt(1 - x^2) : NaNs produced 7: In sqrt(1 - x^2) : NaNs produced 8: In asin(x) : NaNs produced 9: In sqrt(1 - x^2) : NaNs produced 10: In sqrt(1 - x^2) : NaNs produced 11: In asin(x) : NaNs produced 12: In sqrt(1 - x^2) : NaNs produced 13: In sqrt(1 - x^2) : NaNs produced 14: In asin(x) : NaNs produced 15: In sqrt(1 - x^2) : NaNs produced 16: In sqrt(1 - x^2) : NaNs produced 17: In asin(x) : NaNs produced 18: In sqrt(1 - x^2) : NaNs produced 19: In sqrt(1 - x^2) : NaNs produced 20: In asin(x) : NaNs produced 21: In sqrt(1 - x^2) : NaNs produced 22: In sqrt(1 - x^2) : NaNs produced 23: In asin(x) : NaNs produced 24: In sqrt(1 - x^2) : NaNs produced 25: In sqrt(1 - x^2) : NaNs produced 26: In asin(x) : NaNs produced 27: In sqrt(1 - x^2) : NaNs produced 28: In sqrt(1 - x^2) : NaNs produced 29: In asin(x) : NaNs produced 30: In sqrt(1 - x^2) : NaNs produced 31: In sqrt(1 - x^2) : NaNs produced 32: In asin(x) : NaNs produced 33: In sqrt(1 - x^2) : NaNs produced 34: In sqrt(1 - x^2) : NaNs produced 35: In asin(x) : NaNs produced 36: In sqrt(1 - x^2) : NaNs produced 37: In sqrt(1 - x^2) : NaNs produced 38: In asin(x) : NaNs produced 39: In sqrt(1 - x^2) : NaNs produced 40: In sqrt(1 - x^2) : NaNs produced 41: In asin(x) : NaNs produced 42: In sqrt(1 - x^2) : NaNs produced y '− y = x ln x, x ln x y ∞ =0 = e > ham dieukien nghiem plot(nghiem, type = "l", which = "y",lwd = 2, xlab = "Truc x", ylab = "Truc y",main = "PTVP") 5000 10000 15000 Truc y 20000 25000 PTVP 166 168 170 172 Truc x 174 176