题目计算:(1)(−a2)3+2a2⋅a4(1)(-a^{2})^{3}+2a^{2}\cdot a^{4}(1)(−a2)3+2a2⋅a4.(2)(x+1)(x+3)−(x+2)(x−2)(2)\left(x+1\right)\left(x+3\right)-\left(x+2\right)\left(x-2\right)(2)(x+1)(x+3)−(x+2)(x−2).知识点：有理数的混合运算章节：数与式 / 有理数
