(-x+y)2=______(x-y)2(填“+”、“-”)
题型:填空题难度:简单来源:不详
(-x+y)2=______(x-y)2(填“+”、“-”) |
答案
∵(-x+y)2=(x-y)2, ∴括号内应填:“+”. |
举一反三
x-2y-5a+6=x-( )A.-2y-5a+6 | B.2y-5a+6 | C.2y+5a-6 | D.2y+5a+6 |
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下列运算正确的是( )A.2a+3b=5ab | B.2(2a-b)=4a-b | C.4a-a=3 | D.-3(x-2)=-3x+6 |
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如果3xmy5与-2x2yn是同类项,那么m=______,n=______. |
若8x4ym和-2xny3是同类项,则nm=______. |
计算:2ab-(3ab-5a2b)=______. |
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