问题标题:
北大师版七年级上册数学加减整式数学题(只要计算题)速度!很急!
问题描述:

北大师版七年级上册数学加减整式数学题(只要计算题)速度!很急!

尚凤军回答:
  (2x-3y)+(5x+4y)   (8a-7b)-(4a-5b)   -(3x-2y+z)-[5x-(x-2y+z)-3x]   2(7x2+5x-3)-3(5x2-3x+2)   2b3+(3ab3-a2b)-2(ab2+b3)   (-6x2+5xy)-12xy-(2x2-9xy)   (x2-2x3+1)-(-1+2x3+2x2),其中x=2   3a-[-2b+(4a-3b)],其中a=-1,b=3   3ab-4ab+8ab-7ab+ab=   7x-(5x-5y)-y=   23a3bc2-15ab2c+8abc-24a3bc2-8abc=   -7x2+6x+13x2-4x-5x2=   2y+(-2y+5)-(3y+2)=   (2x2-3xy+4y2)+(x2+2xy-3y2)=   2a-(3a-2b+2)+(3a-4b-1)=   -6x2-7x2+15x2-2x2=   2x-(x+3y)-(-x-y)-(x-y)=   2x+2y-[3x-2(x-y)]=   5-(1-x)-1-(x-1)=   已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=   若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为   -(2x2-y2)-[2y2-(x2+2xy)]=   (-y+6+3y4-y3)-(2y2-3y3+y4-7)=   4x2-[7x2-5x-3(1-2x+x2)]=   3a-(2a-3b)+3(a-2b)-b=   x-[y-2x-(x+y)]=   3x-[y-(2x+y)]=   4a2n-an-(3an-2a2n)=   2x2y+3xy2-x2+2xy=   -5xm-xm-(-7xm)+(-3xm)=   当a=-1,b=-2时,   [a-(b-c)]-[-b-(-c-a)]=   当a=-1,b=1,c=-1时,   -[b-2(-5a)]-(-3b+5c)=   -2(3x+z)-(-6x)+(-5y+3z)=   -5an-an+1-(-7an+1)+(-3an)=   3a-(2a-4b-6c)+3(-2c+2b)=   9a2+[7a2-2a-(-a2+3a)]=   当2y-x=5时,5(x-2y)2-3(-x+2y)-100=
查看更多
数学推荐
热门数学推荐