题目化简(1)5(2x−7y)−3(4x−10y)(1)5\left(2x-7y\right)-3\left(4x-10y\right)(1)5(2x−7y)−3(4x−10y)(2)5(a2b−3ab2)−2(a2b−7ab2)(2)5(a^{2}b-3ab^{2})-2(a^{2}b-7ab^{2})(2)5(a2b−3ab2)−2(a2b−7ab2)知识点：整式加减运算法则章节：未标注
