题目计算:(Ⅰ)(a2b3)−1⋅(ab−2)2(Ⅰ)(a^{2}b^{3})^{-1}\cdot (ab^{-2})^{2}(Ⅰ)(a2b3)−1⋅(ab−2)2；(Ⅱ)x2⋅x4−(2x3)2+x7÷x(Ⅱ)x^{2}\cdot x^{4}-(2x^{3})^{2}+x^{7}\div x(Ⅱ)x2⋅x4−(2x3)2+x7÷x.知识点：分式的混合运算章节：数与式 / 分式
