(x y)3(2x-y a)5各项系数和为32 x的系数之和-搜答案-神马作文网

xy/x+y=3则xy=3(x+y)2x-5xy+2y/x-3xy+y=2(x+y)-5xy/(x+y)-3xy=2(x+y)-15(x+y)/(x+y)-9(x+y)=-13(x+y)/-8(x+y

呵呵,令x=1,y=1,代入结果应该是各项系数之和吧!（2-7+3）^3=-8

第一道题：3X²Y-2XY-1ZY-1是_三__次__四_项式,分别是由____3X²Y,-2XY,-ZY,-1______项组成.各项系数是__3,-2,-1,-1__第二题：5

-xy（x^2y^5-xy^3-y)=-(xy^2)^3+(xy^2)^2+xy^2=-(-2)^3+4-2=8+4-2=10

额.你是几年级的啊.

5x^2y/-1/2xy*3xy^2

5x^2y/-1/2xy*3xy^2=-7.5x²y²

解(x+1)平方+/y-1/=0∴x+1=0,y-1=0∴x=-1,y=1∴2(xy-5xy平方)-(3xy平方-xy)=(2xy+xy)+(-10xy平方-3xy平方)=3xy-13xy平方=3×(

(8xy-3x平方)-5xy-2(3xy-2x平方)=8xy-3x²-5xy-6xy+4x²=x²-3xy=4+6=10

x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2=16x^3y^3-49x^3y^3-45^3y^3=-78x^3y^3如果本题有什么不明白可以追问,

多项式1/3x²;y的四次方-5xy的三次方-2/7xy的项数是(3),各项系数分别是(1/3,-5,-2/7),各项的次数分别是(6,4,2)如果本题有什么不明白可以追问,如果满意请点击“

多项式还要有+－号呀,题中没看到.3项.1/3,5,2/76次,4次,2次

第一道题：2次4项式.3X²Y；-2XY；-1ZY；-1组成各项系数是：3；-2；-1；-1.第二道题：1：a²(5-6b)2：xy第3道题：化简得：2{y-x}²-2{

7x的5次方y-8x的2a+3次方y+3xy³-9中,六次项是7x的5次方y,四次项是3xy³,常数项是-9,它是八次多项式,则八次项是-8x的2a+3次方y,其中x的指数是2a+

2X²,-3XY²,X,-1X-3

xy/(x+y)=2xy=2(x+y)(3x-5xy+3y)/(-x+2xy-y)=[3(x+y)-5xy]/[2xy-(x+y)]=[3(x+y)-10(x+y)]/[4(x+y)-(x+y)]=-

5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2=5xy^2-3xy^2+(4xy^2-2x^y)+x^2y-xy^2=5xy^2-3xy^2+4xy^2-2x^y+x^2y-

原式=-xy²（x²y^4-xy²-1）∵xy²=-2原式=2（（-2)²-（-2）-1）=10

2x平方y-2xy+3xy平方+5+2xy+x平方y-3xy平方-3=2x²y-2xy+3xy²+5+2xy+x²y-3xy²-3=3x²y+2