数学题(x平方+3x+2分之x-1)+继续(2+x-x平方分之6)-(4-x平方分之10-x)
问题描述:
数学题(x平方+3x+2分之x-1)+
继续(2+x-x平方分之6)-(4-x平方分之10-x)
答
(x平方+3x+2分之x-1)+(2+x-x平方分之6)-(4-x平方分之10-x)
=(x-1)/[(x+1)(x+2)]-6/[(x-2)(x+1)]-(10-x)/[(x-2)(x+2)]
=[(x-1)(x-2)-6(x+2)+(10-x)(x+1)]/[(x+1)(x+2)(x-2)]
=0/[(x+1)(x+2)(x-2)]
=0
答
(x平方+3x+2分之x-1)+(2+x-x平方分之6)-(4-x平方分之10-x)=(x-1)/(x+2)(x+1)-6/(x-2)(x+1)-(x-10)/(x+2)(x-2)=[(x-1)(x-2)-6(x+2)-(x-10)(x+1)]/(x+1)(x-2)(x+2)=(x²-3x+2-6x-12-x²+9x+10)/(x+1)(x-...