计算:(整式加减)(1)(8xy-3x2)-5xy-3(xy-2x2+3);(2)3(x-y)-2(x+y)-5(x-y
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/10/06 06:04:14
计算:(整式加减)
(1)(8xy-3x2)-5xy-3(xy-2x2+3);
(2)3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y);
(3)3(x2y-2xy2+x)-2(2x+5x2y-xy2);
(4)5x2-[7x-(4x-3)-2x2].
(1)(8xy-3x2)-5xy-3(xy-2x2+3);
(2)3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y);
(3)3(x2y-2xy2+x)-2(2x+5x2y-xy2);
(4)5x2-[7x-(4x-3)-2x2].
一8xy-6-5xy-3(xy-1) = 8xy-5xy-3xy-6+3 =-3
二3x-3y-2x-2y-5x+5y+4x+4y+3x-3y =3x+y
三6xy-12xy+3x-4x-20xy+4xy =-22xy-x
四10x-(7x-4x+3-4) =1ox-7x+4x-3+4 =7x+1
二3x-3y-2x-2y-5x+5y+4x+4y+3x-3y =3x+y
三6xy-12xy+3x-4x-20xy+4xy =-22xy-x
四10x-(7x-4x+3-4) =1ox-7x+4x-3+4 =7x+1
因式分解方法x2-xy+2x-y-3是x方-xy+2x-y-3,
计算:3xy[2xy-x(y-2)+x]
x2-(a+b)xy+aby2 x2+4xy-5y2 x2-5x+3 2x2+xy-y2-4x+5y-6
先化简再求值2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)],其中x=-1,y=-2.
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知 (x+1)² +|y-1|=0,求 2(xy-xy²)-(3xy²-xy) 的值.
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
先化简,后求值:4xy-(2x2+5xy-y2)+2(x2+3xy),其中|x+2|+(y−12)
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.