若3xm-2yn+3与-5x5y2是同类项,则m+n=______.
题型:填空题难度:一般来源:不详
若3xm-2yn+3与-5x5y2是同类项,则m+n=______. |
答案
∵3xm-2yn+3与-5x5y2是同类项, ∴, 解得:, 则m+n=7+(-1)=6. 故答案为:6. |
举一反三
当m=______,n=______时,x2y2m和x2ny8是同类项. |
若-2axby与7a2b5的和是单项式,则多项式x3-y2的值为______. |
下列各项中是同类项的是( )A.-mn与mn | B.2ab与2abc | C.x2y与x2z | D.a2b与ab2 |
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下列去括号正确的是( )A.-(a+b)=-a-b | B.-(3x-2)=-3x-2 | C.a2-(2a-1)=a2-2a-1 | D.x-2(y-2)=x-2y+2 |
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单项式-3xmy3与单项式x4yn是同类项,则m-2n=______. |
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