若5x2y｜m｜-(m＋1)y2-3是三次三项式,则m等于( )如题:若5x2y｜m｜-4(1)(m＋1)y2-3是三次三项式,则m等于( )

若5x2y｜m｜-(m＋1)y2-3是三次三项式,则m等于( )如题:若5x2y｜m｜-4(1)(m＋1)y2-3是三次三项式,则m等于( ) 已知5x2y ▕ m▕-4分之1（m+1）y2-3是三次三项式,则m等于? 若m=x3-3x2y+2xy2+3y2 n=x3-2x2y+xy2-5y3,则2x3-7x2y+5xy2+14y2等于( )若m=x3-3x2y+2xy2+3y2 n=x3-2x2y+xy2-5y3,则2x3-7x2y+5xy2+14y2等于( )空里用字母表示 几道关于整式加减数学题,=1.3x+2xy-4y2-3xy=4y2-3x22.3x3-[x3+(6x2-7x)]-2(x3-3x2-4x)3.(3x2-4y2)+[-（x2-2xy-y2）]-[-(3x2-2xy-y2)]4.已知：(x=2)2+|y=1|=0,求5xy2-{2x2y-[3x2y-(4xy2-2x2y)]}的值5.如果A=3m2-m+1,B=2m2-m-7且A-B+C=0,求C以上 一.先化简,再求值.(-x2+5+4x)+(5x-4+2x2) 二.计算 (1) x2y-3x2y (2)10y2+0.5y2 (3)-1/2a2bc+1/2cba2 (4)1/4mn-1/3mn+7 (5)7ab-3a2b2+7+8ab2+3a2b2-3-7ab (6)3x3-3x2-y2+5y+x2-5y+y2 三.计算{难点} (1) (4a3b-10b3)+(-3a2b2+10b3) (2) (4x2y-5xy2)-(3x2y- 已知m,x,y满足条件：（1）2/3（x-5）的2次方+5|m|=0已知m,x,y满足条件：（1）2/3(x-5)2+5×(m的绝对值）=0；（2）-2a2b^(y+1)与3b3a2是同类项.求代数式0.75x2y+5m2x-{-7/16x2y+[1/4xy2+(-3/16x2y-3.475xy2)]-6.27xy2}的值. 初三 数学 衔接 请详细解答,谢谢! (3 19:13:26)已知x2+10xy+25y2-1=0,化简x三次方+5x2y+x2 若单项式-2x2y/3的系数是m,次数是n,则mn的值为 已知(x+3)2+1x-y+101=0,求5x2y-[2x2y-(3xy-xy)2-3x2]-2xy-y2 试说明:无论x,y取何值时,代数式(x3+3x2y-5+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y2)的值是常数.要具体过程,注意格式 若M,N为单项式且1/2x2y+M=1/2xy(N+2y),求M,N 若M,N为单项式且1/2x2y+M=1/2xy(N+2y),求M,N .当m=( )时,单项式五分之一2m-1 y2与-8x m+3 y2是同类项. 因式分解：(1)(x-y)(x2-xy+y2)+xy(y-x).(2)-2xy-4x2y+2xy2.(3)3x2(a+3)-4x2y(a+3)求过程结果.跟在字母后边的数字例如2是平方.数字在前面是数字.（5）a2-3a+2（6）(x-y)(x2-xy+y2)+xy(y-x) 一定要有过程结果.（1）若（x x2+y2-x2y-4xy-1因式分解 4x2y-｛x2y-「3xy2 – 1/ 2（4x2y-8xy2）+x2y」｝-5xy2 在此题中2是x或y的平方（2次方） 若椭圆x2/5+y2/m=1(0 (5)先化简,再求值:3x2y-[2x2y-(2xy-3x2y)]+3xy2,其中x=3,y=-1/3(5)先化简,再求值：3x2y－[2x2y－(2xy－3x2y)]＋3xy2,其中x＝3,y＝1/3