下列各题中合并同类项,结果正确的是( )A.2a2+3a2=5a2B.2a2+3a2=6a2C.4xy-3xy=1D.2x3+3x3=5x6
题型:单选题难度:一般来源:不详
下列各题中合并同类项,结果正确的是( )A.2a2+3a2=5a2 | B.2a2+3a2=6a2 | C.4xy-3xy=1 | D.2x3+3x3=5x6 |
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答案
A、正确; B、2a2+3a2=5a2; C、4xy-3xy=xy; D、2x3+3x3=5x3. 故选A. |
举一反三
下列各组中的两项是同类项的是( )A.ab与abc | B.-53与-x3 | C.5x2y与3y2x | D.-2xy与-5yx |
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下列运算中,正确x是( )A.5a-(b+2c)=5a+b-2c | B.5a-(b+2c)=5a-b+2c | C.5a-(b+2c)=5a+b+2c | D.5a-(b+2c)=5a-b-2c |
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-[a-(b-c)]去括号应得( )A.-a+b-c | B.-a-b+c | C.-a-b-c | D.-a+b+c |
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若-2xym和xny3是同类项,则( )A.m=1,n=1 | B.m=1,n=3 | C.m=3,n=1 | D.m=3,n=3 |
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如果单项式5am-1bn-5与a2m+1b2n+3是同类项,则m=______,n=______. |
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