题目计算:(1)2a3⋅a4+a5⋅a2−a9÷a2(1)2a^{3}\cdot a^{4}+a^{5}\cdot a^{2}-a^{9}\div a^{2}(1)2a3⋅a4+a5⋅a2−a9÷a2；(2)(−2x2)⋅(−3x2y2)2(2)(-2x^{2})\cdot (-3x^{2}y^{2})^{2}(2)(−2x2)⋅(−3x2y2)2.知识点：整式的混合运算;零指数幂;负整数指数幂章节：未标注
