来自何为的问题
计算:①(a+b)(a^2-ab+b^2)②(3xy)^2/xy+(x-y)^2-(x+y)(x-y)③(a-b)^2+b(a-b)④(3x+2)(3x-2)-5x(x-1)-(2x-1)^2
计算:①(a+b)(a^2-ab+b^2)②(3xy)^2/xy+(x-y)^2-(x+y)(x-y)③(a-b)^2+b(a-b)
④(3x+2)(3x-2)-5x(x-1)-(2x-1)^2
1回答
2020-12-01 02:43