题目计算:(1)(x−2y)2−2y(y−2x)\left(1\right)\left(x-2y\right)^{2}-2y\left(y-2x\right)(1)(x−2y)2−2y(y−2x)；(2)(m+1+2m+3m+1)÷m2−4m+1(2)(m+1+\frac{2m+3}{m+1})÷\frac{m^{2}-4}{m+1}(2)(m+1+m+12m+3)÷m+1m2−4.知识点：分式的混合运算章节：数与式 / 分式
