f4=3*-4米E-8*D+4*B-9 f5=’4*A_2*C-4米B-8米E+10 [A, B, C, D, E]=solve(f1, f2, f3, f4, f5) A=1B=2C=-1D=-1E=1 dx x5+x4-5x3-2x2+4x-8 x-2x+2(x+2) =n|x-2|+2n|x+2|+ ln(x2-x+1+ x+2 2|(x+2 actg x2-x+1x+2 另一种方法是 4x2+9x-10=A(x+2) +1+B(x-2)(x+2)(x2-x+1) 1)+(Dx+E)(x-2)(x+2 得 10=4-4B+2-8E x=1→4=9-3B+1-9(D+B) x=-1→-12=3-9B+9-3(2-D)f4='3*C-4*E-8*D+4*B-9' ; f5='4*A-2*C-4*B-8*E+10' ; [A,B,C,D,E]=solve(f1,f2,f3,f4,f5) A =1 B =2 C =-1 D =-1 E =1 另一种方法是 令 得