将(x+y)+2(x+y)-4(x+y)合并同类项得( )A.x+yB.-x+yC.-x-yD.x-y
题型:单选题难度:一般来源:不详
将(x+y)+2(x+y)-4(x+y)合并同类项得( ) |
答案
(x+y)+2(x+y)-4(x+y)=(1+2-4)(x+y)=-x-y, 故选C. |
举一反三
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