来自郭崇志的问题
(1)当│x+1│=0求代数式-3x^n+1-x^n+6x^n+1+3x^n-x^n+1的值.(2)已知x-y=3y=-2求代数式4(x+y)+(x-y)-(x+y)-5(x-y)值.(3)已知│M-2│+(3-3n)^2=0,化简2x^m-n+1y^3-6y^m+nx^2.
(1)当│x+1│=0求代数式-3x^n+1-x^n+6x^n+1+3x^n-x^n+1的值.
(2)已知x-y=3y=-2求代数式4(x+y)+(x-y)-(x+y)-5(x-y)值.
(3)已知│M-2│+(3-3n)^2=0,化简2x^m-n+1y^3-6y^m+nx^2.
1回答
2020-12-10 09:52