下列添加括号正确的是( )A.-x-y=-(x-y)B.6x2+2x=2x(3x+2)C.a2+b2+2b-1=a2-(b2-2b+1)D.12a-2=12(
题型:单选题难度:简单来源:不详
下列添加括号正确的是( )A.-x-y=-(x-y) | B.6x2+2x=2x(3x+2) | C.a2+b2+2b-1=a2-(b2-2b+1) | D.a-2=(a-4) |
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答案
A、-x-y=-(x+y),错误; B、6x2+2x=2x(3x+1),错误; C、a2+b2+2b-1=a2-(-b2-2b+1),错误; D、正确. 故选D. |
举一反三
若-3xny8与x2y2m+2是同类项,则n-m=______. |
下面添括号正确的是( )A.2a-3b+c-=-(-2a+3b-c+) | B.x2-2x-y+2x3-2y=-2x-(y-2y)-(-x2-2x3) | C.(a-b)(b-c)(c-a)=[-(a-b)][-(b-c)[-(c-a)] | D.(a-b-c)(a+b-c)=[a-(b-c)][a+(b-c)] |
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若5xn+1y5与-2x3ym+1是同类项,则2m+n=______. |
若单项式a4b-2m+1与-am2bm+7是同类项,则m=______. |
若x2y+2和-x2yn-1是同类项,则n的值为( ) |
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