x＋1＝5(y+2)。3(2x-5)－4(3y+4)＝5

3x(2x＋y)－2x(x-y),其中x＝1,y=1/5算术题？结果5

函数1、y＝0.3x减7；2、y＝－2x＋5；3、y＝4减3x；；4、y＝－x；5、y＝3x；6、y＝－（1减x）问题在补充中其中y值随x的值增大而增大的函数是（写序号）y随x值增大而减少的函数是(写序号）1,5,6;2,3,4

(x-4y)(x-y)-(x+3y)(x-6y)-5x(2-y),其中x=﹣1/3,y=1/2(x²-nx+3)(x²+3x+m)的展开式中不含x²和x³项,求m和n的值原式=x²-5xy+

求解;一(x-8y)(x-y)二(Y+2)(Y-2)-(Y-1)(Y+5)三(3X+4)(3X-4)-(2X+3)(3X-2)麻烦写一下详细的解答过程,谢谢1)(x-8y)(x-y)=x^2-9xy+8y^22)(Y+2)(Y-2)-(Y-

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

5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解5x^3y(x-y)^3-10x^4y^3(y-x)^2=5x^3y(x-y)^3-10x^4y^3(x-y)^2=5x^3y(x-y)^2[(x-y)-2x]=5x^3y(x

5x^3y(x-y)^3-10x^4y^3(y-x)^25x^3y(x-y)^3-10x^4y^3(y-x)^2=5x³y(x-y)³-10x^4y³(x-y)²=5x³y(x-y)

(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算原式=(6x²-8xy-3xy+4y²)-2(2x²-5xy-2xy+5y²)=6x²-11xy+4y²-4x

5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解5X^3Y(X-Y)-10X^4Y^3(Y-X)^2=5x^3y(x-y)[1-2xy^2(x-y)]=5x^3y(x-y)(1-2x^2y^2+2xy^3)

3(x+y)+2(x-y)=364(x+y)-5(x-y)=23(x+y)+2(x-y)=364(x+y)-5(x-y)=25x+y=36-x+9y=2解得y=1,x=7遇到这种问题，老师也会叫你先展开吧？这两个方程太复杂，咱莱一步一步看3

4(x-y)-3(x-y)=95(x-y)+2(x-y)=11打错了吧,这样连x-y都解不出

3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27化简得：-x+7y=11①7x+3y=27②①式×7得：-7x+49y=77③②+③得：52y=104∴y=2代入①得：x=3∴x=3,y=2

（x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5（x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5=(x-y)^3×(x-y)^4+(x-y)^2×[-(x-y)]^5=(x-y)^7-(x-y)^7=0（x-y）

x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8因式分解（过程）(x-y)^8

因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)=(x-2y)[(x-3y)

(1)（3x-2y）（y-3x）-（2x-y）（3x+y）(2)(3x+2y+4)(5x-2y-1)计算①原式=3xy-9x^2-2y^2+6xy-6x^2-2xy+3xy+y^2=-15x^2-y^2+10xy②原式=15x^2-6xy-

（x+2)(x+3)(x-4)(x+1)(y+4)(y-2)(y-5)(y-3)解方程组：（x+10）（x-8）=x的平方-100（x+2)(x+3)=x²+5x+6(x-4)(x+1)=x²-3x-4(y+4)(y-2

1.｛x/2=y/33x+4y=92.{4x-3y=-4x/4+y/3＝63.{(2x-1)/5+(3y-2)/4=2(3x+1)/5-(3y+2)/4=0在等式y＝kx+b中,当x＝1时,y＝-2时；当x＝-1时,y＝-4,求k、b的值.

(等比级数)求(x-y)+[(y^2/x)-(y^3/x^2)+(y^4/x^3)-(y^5/x^4)+.n项的和(等比级数)求(x-y)+[(y^2/x)-(y^3/x^2)+(y^4/x^3)-(y^5/x^4)+.n项的和这个是清楚的

3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y)化简合并同类项3x+y求采纳=3(x-y)-5(x-y)+3(x-y)-2(x+y)+4(x+y)=(x-y)（3-5+3）+(x+y)（-2+4）=(x-y)+2(x+y