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有理数计算题
1、38+〔－22〕+〔+62〕+〔－78〕 2、〔－〕+0+〔+〕+〔－〕+〔－〕
3、〔－23〕+|－63bc2-15ab2c+8abc-24a3bc2-8abc=______．6．-7x2+6x+13x2-4x-5x2=______．7．2y+(-2y+5)-(3y+2)＝______．11．(2x2-3xy+4y2)+(x2+2xy-3y2)=______．12．2a-(3a-2b+2)+(3a-4b-1)=______．13．-6x2-7x2+15x2-2x2＝______．14．2x-(x+3y)-(-x-y)-(x-y)＝______．16．2x+2y-[3x-2(x-y)]=______．17．5-(1-x)-1-(x-1)=______．18．( )+(4xy+7x2-y2)=10x2-xy．19．(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3．21．A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______．22．A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______．23．假如a=-,b=,代数式-(|a2b|-|ab2|)的值为______．25．一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______．26．-(2x2-y2)-[2y2-(x2+2xy)]=______．27．假如-3a3b2与5ax-1by+2是同类项,如此x=______,y=______．28．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______．29．化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______．30．2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．31．3a-(2a-3b)+3(a-2b)-b=______．32．化简代数式x-[y-2x-(x+y)]等于______．33．[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1．34．3x-[y-(2x+y)]=______．35．化简|1-x+y|-|x-y|(其中x＜0,y＞0)等于______．36．x≤y,x+y-|x-y|=______．37．x＜0,y＜0,化简|x+y|-|5-x-y|=______．38．4a2n-an-(3an-2a2n)＝______．39．假如一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy,如此这个多项式为______．40．-5xm-xm-(-7xm)+(-3xm)=______．41．当a=-1,b=-2时,[a-(b-c)]-[-b-(-c-a)]＝______．43．当a=-1,b=1,c=-1时,-[b-2(-5a)]-(-3b+5c)＝______．44．-2(3x+z)-(-6x)+(-5y+3z)=______．45．-5an-an+1-(-7an+1)+(-3an)＝______．46．3a-(2a-4b-6c)+3(-2c+2b)=______．48．9a2+[7a2-2a-(-a2+3a