麻烦点击分了右侧倒三角将分类修改成数学4[a²-1-(3a-2/2)]-15[(2a²-5)/3-(a-3)/5=4a²-4-4(3a-2/2)-5(2a²-5)-3(a-3)=4a²-4-2(3a-2)-(10a²-25)-(3a-9)=4a²-4-6a+4-10a²+25-3a...