diff --git a/Matlab/lab3.m b/Matlab/lab3.m
index a3d32dd..02ae20d 100644
--- a/Matlab/lab3.m
+++ b/Matlab/lab3.m
@@ -57,4 +57,17 @@ Ys = H*Fs;
 yts = ilaplace(Ys);
 subplot(3, 1, 3);
 fplot(yts*heaviside(t));
-title('零状态响应');
\ No newline at end of file
+title('零状态响应');
+
+%% 5
+syms t s;
+f = (-t+1)*(heaviside(t)-heaviside(t-2))-(heaviside(t-2)-heaviside(t-3));
+subplot(2, 1, 1);
+ezplot(f);
+subplot(2, 1, 2);
+F = laplace(f);
+H = 1/(s^2+5*s+4);
+Y = F*H;
+y = ilaplace(Y);
+ezplot(y);
+