format long 
P = @(x)0.3*(x+0.0493)*(x-0.1321)*(x-0.2988)/(-0.2488+0.0493)/(-0.2488-0.1321)/(-0.2488-0.2988)+0.4*(x+0.2488)*(x-0.1321)*(x-0.2988)/(-0.0493+0.2488)/(-0.0493-0.1321)/(-0.0493-0.2988)+0.5*(x+0.0493)*(x+0.2488)*(x-0.2988)/(0.1321+0.2488)/(0.1321+0.0493)/(0.1321-0.2988)+0.6*(x+0.0493)*(x+0.2488)*(x-0.1321)/(0.2988+0.2488)/(0.2988+0.0493)/(0.2988-0.1321);
P(0)