2(x-3y) (负1 4减5y)减3(1 4x减y)怎么算
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x^2-y^2=(x+y)(x-y)=-6(m-1/m)^2=m^2-2+1/m^2=16m^2+1/m^2=18(m^2+1/m^2)^2=m^4+2+1/m^4=324m^4+1/m^4=322
当2y-x=55(x-2y)²-3(-x+2y)-100=5(x-2y)²-3(2y-x)-100=5x25-3x5-100=125-15-100=10
3x+3y=5x+y=5/3-2x-2y+6=-2(x+y)+6=-2×5/3+6=6-10/3=8/3希望对您有所帮助
{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方={2/3x-[2/(x+y)]*[(x+y)-3x(x+y)]/(3x)}*[x/(x-y)]^2={2/3x-
解(有点错误,正在修改)(5y/6x^3)^2除以(负5y^2分之3x^4)^3=(25y^2/36x^6)除以(-125y^6分之27x^12)=-(25y^2/36x^6)*(125y^6/27x
2x-5y=34x-5y=6与2式相加4x-5y-4x+y=6-3-4y=3y=-3/42x=5y+3=-3/4x5+3=-3/4x=-3/8如果本题有什么不明白可以追问,再问:晚了伙计算了
x+y=5xy=-3(2x-3y-2xy)-(x-4y+xy)=2x-3y-2xy-x+4y-xy=x+y-3xy=5-3×(-3)=5+9=14
0.8x-1.7y=-7(1)5x-3y=2(2)(1)*50-(2)*840x-85y-40x+24y=-350-16-61y=-366y=6x=4
5X-3Y=212X-3Y=-1021-2得3X=12x=4将x=4带入Y=6X=4Y=6
x-2y=-5x=2y-5代入3x=4y得3【2y-5]=4yy=7.5x=7.5×4÷3=10
1.x=-3-y,5x+5y-2=5(-3-y)+5y-2=-172.(1)2x平方=7+3x,原式=2(7+3x)-6x+5=19(2)原式=1/3(7+3x)-x+5/3=123.D(题目输入有歧
原式=x²+9xy+20y²-x²+y²=9xy+21y²=9*(-8/3)*(3/7)+21*9/49=-45/7
y=2x-5①x+3y=-1②将①代入②得x+3(2x-5)=-1x+6x-15=-17x=14x=2将x=2代入①得y=2×2-5=-1所以方程组的解为x=2y=-1
(2X+5Y)-(2X-3Y)=-3-5,8Y=-8,Y=-1,带入原方程求X.希望采纳
原式=-x-7y-7y/3+2(5x-4y)/3=-x-7y-7y/3+10x/3-8y/3=7x/3-12y当x=3,y=-2时原式=7+24=31
3x的负5次方y的平方除以4x的负2y的负三次方=3/4x的负5次方y的平方×x²y³=3/4x的-3次方y的5次方再问:(a的三次方—3a的2次方除以a的2次方——9)—5次方,
5(2x平方y减3x)减2(4x减3x平方y),其中x=1/2,y=负1=10x²y-15x-8x+6x²y=16x²y-23x=16×(1/4)×(-1)-23×(1/
6X+9Y=66X+16Y=-4两式相减得Y=-10/7X=22/7求采纳求赞求赞
2或8,由x加y的绝对值等于负x负y,知道-x-y>=0所以-x>=y,x=3或-3,y=-5,再算x-y就行了
1.y:x=2:55y=2xy=2/5xy-x=-62/5x-x=-6x=10y=4x+y=142.2y-3x=-113x-2y=11x=5,y=2x=7,y=5x=9,y=810x+y=52,75,