(1){[(x^2)+7x+10]/[(x^3)-(x^2)-6x]}*{[(x^2)-2x-3]/[(x^2)+6x+5]}(2){[(x^2)-7x+6]/[(x^2)+3x-4]}/{[(x^2)-14x+48]/[(x^2)+10x+24]}*{[(x^3)-(8x^2)]/[(x^2)y+6xy]}(3){[8-6x+(x^2)]/[(x^2)-16]}/{[(x-2)/(4-3x)]^2}*{[(x^2)+2x-8]/[(3x^2)-13x+12]}(4){[(a^2)+ab-ac]
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(1){[(x^2)+7x+10]/[(x^3)-(x^2)-6x]}*{[(x^2)-2x-3]/[(x^2)+6x+5]}(2){[(x^2)-7x+6]/[(x^2)+3x-4]}/{[(x^2)-14x+48]/[(x^2)+10x+24]}*{[(x^3)-(8x^2)]/[(x^2)y+6xy]}(3){[8-6x+(x^2)]/[(x^2)-16]}/{[(x-2)/(4-3x)]^2}*{[(x^2)+2x-8]/[(3x^2)-13x+12]}(4){[(a^2)+ab-ac]
(1){[(x^2)+7x+10]/[(x^3)-(x^2)-6x]}*{[(x^2)-2x-3]/[(x^2)+6x+5]}
(2){[(x^2)-7x+6]/[(x^2)+3x-4]}/{[(x^2)-14x+48]/[(x^2)+10x+24]}*
{[(x^3)-(8x^2)]/[(x^2)y+6xy]}
(3){[8-6x+(x^2)]/[(x^2)-16]}/{[(x-2)/(4-3x)]^2}*{[(x^2)+2x-8]/
[(3x^2)-13x+12]}
(4){[(a^2)+ab-ac]/[(a^2)-ab]}*{[(a^2)+(b^2)-(c^2)-2ab]/[(a^2)+2ab
+b^2]}/{[(a^2)+2bc-(b^2)-(c^2)]/[(a^2)-(b^2)]}
(1){[(x^2)+7x+10]/[(x^3)-(x^2)-6x]}*{[(x^2)-2x-3]/[(x^2)+6x+5]}(2){[(x^2)-7x+6]/[(x^2)+3x-4]}/{[(x^2)-14x+48]/[(x^2)+10x+24]}*{[(x^3)-(8x^2)]/[(x^2)y+6xy]}(3){[8-6x+(x^2)]/[(x^2)-16]}/{[(x-2)/(4-3x)]^2}*{[(x^2)+2x-8]/[(3x^2)-13x+12]}(4){[(a^2)+ab-ac]
1)=(X+2)(X+5)(X-3)(X+1)/[X(X-3)(X+2)(X+1)(X+5)]
=1/X
2)=(X-6)(X-1)(X-6)(X-8)*X^2(X-8)/[(X+4)(X-1)(X+4)(X+6)XY(X+6)]
=X/Y*(X-6)^2*(X-8)^2/[(X+4)^2(X+6)^2]
这个都是最基本的,为什么不自己做呢