(x+2分之x+3)+(x²-4分之2-x)= 要有计算步骤
问题描述:
(x+2分之x+3)+(x²-4分之2-x)= 要有计算步骤
答
(x+3)/(x+2)+(2-x)/(x²-4)
=(x+3)/(x+2)+(2-x)/[(x+2)(x-2)]
=(x+3)/(x+2)-1/(x+2)
=(x+3-1)/(x+2)
=(x+2)/(x+2)
=1请问下可以通分计算吗?虽然比较复杂,如果能,麻烦你写一下好吗?(x+3)/(x+2)+(2-x)/(x²-4)=(x+3)/(x+2)+(2-x)/[(x+2)(x-2)]=(x-2)(x+3)/[(x+2)(x-2)]+(2-x)/[(x+2)(x-2)]=(x²+x-6+2-x)/[(x+2)(x-2)]=(x²-4)/(x²-4)=1