计算 (3X-5Y)+(-3X+Y) 7X-「-2X-(8X-1)」
1个回答
=3x-5y-3x+y
=-4y
=7x-(-2x-8x+1)
=7x+2x+8x-1
=17x-1
相关问题
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
计算:(1)(-7x2-8y2)•(-x2+3y2)=______;(2)(3x-2y)(y-3x)-(2x-y)(3x
计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8
{y=3x-7{5x+2y=8{x-2y=3{2y+x=-1{2y-x=6{2x+y=8
计算 3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)
初中数学题1/4y=5y+1 7x+6=-6x 3/5y-8=1 -2x-3=-x+3 2x-1/8=x/7+1/2 -
解方程(1) {5x+2y=2 7x-5y=34 (2){8x+3y+2=0,6x+5y+7=0 (3){x+1/3-y
下列式子:①-3x;②[x/y];③[2/3]x_ y-7xy_ ;④-[1/8]x;⑤[3/5+y
计算:(x-3y)(x+7y)化简:(-4x+1)(2x+3)-(-8x)(x+1)先化简,再求值:2(x-8)(x+5
8y-(8-5y)=3y+2(4y+7) 8-3y=6-x 4x-3(20-x)=5x-7(20-