3n-[5n+(3n-1)].
题型:解答题难度:一般来源:不详
3n-[5n+(3n-1)]. |
答案
3n-[5n+(3n-1)]=3n-[5n+3n-1] =3n-[8n-1] =3n-8n+1 =-5n+1. 故答案为-5n+1. |
举一反三
下面去括号错误的是( )A.3(a-b)=3a-b | B.a+(b-c)=a+b-c | C.a-(b+c)=a-b-c | D.-(a-2b)=-a+2b |
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下列运算正确的是( )A.5a2-3a2=2 | B.6xy2-7xy2=-xy2 | C.3a+2b=5ab | D.2x2+3x=5x3 |
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已知2007xn+7与2008x2m+3是同类项,则(2m-n)2=______. |
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