要七年级上册15道解方程,15道化简,15道四则混合运算混合运算和化简都要有负数,
<p>问题：要七年级上册15道解方程,15道化简,15道四则混合运算混合运算和化简都要有负数,<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">彭宇的回答：<div class="content-b">网友采纳 ．3ab-4ab+8ab-7ab+ab=______． 4．7x-(5x-5y)-y=______． 5．23a3bc2-15ab2c+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-=______． 17．5-(1-x)-1-(x-1)=______． 18．()+(4xy+7x2-y2)=10x2-xy． 19．(4xy2-2x2y)-()=x3-2x2y+4xy2+y3． 21．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______． 22．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______． 23．若a=-0.2,b=0.5,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)-=______． 27．若-3a3b2与5ax-1by+2是同类项,则x=______,y=______． 28．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______． 29．化简代数式4x2-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-等于______． 33．+[()a2-4a+()]=a2+2a+1． 34．3x-=______． 35．化简|1-x+y|-|x-y|(其中x＜0,y＞0)等于______． 36．已知x≤y,x+y-|x-y|=______． 37．已知x＜0,y＜0,化简|x+y|-|5-x-y|=______． 38．4a2n-an-(3an-2a2n)＝______． 39．若一个多项式加上-3x2y+2x2-3xy-4得 2x2y+3xy2-x2+2xy, 则这个多项式为______． 40．-5xm-xm-(-7xm)+(-3xm)=______． 41．当a=-1,b=-2时, -[-b-(-c-a)]＝______． 43．当a=-1,b=1,c=-1时, --(-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+=______． 50．当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______．
页:
[1]