1.(x-y)÷(x的1/3次方-y的1/3次方)-(x+y)÷(x的1/3次方+y的1/3次方) 2.(x-1)/(x的2/3次方+x的1/3次方+1)+(x+1)/(x的1/3次方+1)-(x-x的1/3次方)/(x的1/3次方-1)

问题描述:

1.(x-y)÷(x的1/3次方-y的1/3次方)-(x+y)÷(x的1/3次方+y的1/3次方) 2.(x-1)/(x的2/3次方+x的1/3次方+1)+(x+1)/(x的1/3次方+1)-(x-x的1/3次方)/(x的1/3次方-1)

1 原式=((X-Y)(X的1/3次方+y的1/3次方)-(X+Y)(x的1/3次方-y的1/3次方))/(x的2/3次方-y的2/3次方) =(2XY^(1/3)-2X^(1/3)Y)/(x的2/3次方-y的2/3次方) =2X^(1/3)Y^(1/3) 第2题的解法也是大同小异,先通分...