一.(x^2+3x+2)/(x-1)+(2+x-x^2)/6-(4-x^2)/(10-x)二.(x+1-(1-x)/1)÷(x-(x-1)/x^2)三.((x^2-x-6)/(x^2-4)+(x-3)/(x+2))÷(x-3)/(x+1)四.(x-y)/x*(x+y)/y^2-(x^4-y^4)/x^4y÷(x^2+y^2)/x^2

Question

一.(x^2+3x+2)/(x-1)+(2+x-x^2)/6-(4-x^2)/(10-x)
二.(x+1-(1-x)/1)÷(x-(x-1)/x^2)
三.((x^2-x-6)/(x^2-4)+(x-3)/(x+2))÷(x-3)/(x+1)
四.(x-y)/x *(x+y)/y^2-(x^4-y^4)/x^4y ÷ (x^2+y^2)/x^2

Answer 1

一,答案为o二,1-x/1三,4/(x-3）(x+1)四看不明白