合并同类项xy-4xy-(-2xy)=______.
题型:填空题难度:简单来源:不详
合并同类项xy-4xy-(-2xy)=______. |
答案
原式=xy-4xy+2xy =-xy. 故答案为:-xy. |
举一反三
若单项式-3x4a-by2与单项式x3ya+b是同类项,则这两个单项式的和是( )A.-x2y2 | B.-x3y2 | C.-x3y2 | D.-x3y3 |
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a-b-c+d=a-b-(______)=a+(______)=a-(______). |
若单项式3x4yn与-2x2m+3y3的和仍是单项式,则(4m-n)n=______. |
若5xy2+axyb=-2xyb,则ab=______. |
已知-25a2mb和7b3-na4是同类项,则m+n的值是( ) |
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