下列去括号错误的是( )A.a3-3(a+1)=a3-3a-1B.a3-2(a+b)=a3-2a-2bC.1-(x-y-z)=1+x+y+zD.1-(x-y+
题型:单选题难度:一般来源:不详
下列去括号错误的是( )A.a3-3(a+1)=a3-3a-1 | B.a3-2(a+b)=a3-2a-2b | C.1-(x-y-z)=1+x+y+z | D.1-(x-y+z)=1-x+y-z |
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答案
A、a3-3(a+1)=a3-3a-1;故本选项正确; B、a3-2(a+b)=a3-2a-2b;故本选项正确; C、1-(x-y-z)=1-x+y+z;故本选项错误; D、1-(x-y+z)=1-x+y-z;故本选项正确; 故选C. |
举一反三
若2xm-1y2与-2x2yn是同类项,则(-m)n=______. |
(1)计算:2a2+3a2=______. (2)已知∠1与∠2互余,∠1=55°,则∠2=______°. |
若单项式2x2ym与-3xny3是同类项,则m+n的值是______. |
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