[x-5]*[y 2]解法
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∵3x+5y2+3=6,即3x+5y2=3,∴原式=6x+10y2-7=2(3x+5y2)-7=6-7=-1.
(x2+y2)/(x-y)=(x2+y2-2xy+2xy)/(x-y)因为xy=1,所以=[(x-y)^2+2]/(x-y)=(x-y)+2/(x-y)因为x>y>0所以(x-y)>0所以有不等式的定
(3x-2)(5x+1)=0,✘1=-1/5,✘2=2/3再问:给个过程再答:这不是过程吗?再答:后面的提2出来,再答:在移项再问:咋变的再答:2(5x+1)再问:好了我会
解-2(X+1)/3+(X-5)/6=20-4(X+1)+X-5=120-4X-4+X-5=120-3X=129X=-43
∵5x(x+2)=4x+8,∴5x(x+2)-4(x+2)=0,∴(x+2)(5x-4)=0,∴x+2=0或5x-4=0,解得:x1=-2,x2=45.
x(x-2)+5x=0x²-2x+5x=0x²+3x=0(x+3)x=0x=-3或0数学120:祝你学习愉快!
(1)由y2=x+7x2+y2=5得x2+x+2=0,∵△=1-8=-7<0,∴抛物线与圆没有公共点.(2)由题意知AD与BC的中点相同,设l为y=k(x-a),由y2=x+7y=k(x−a),得ky
5x(3x+2)=6x+45x(3x+2)=2(3x+2)5x(3x+2)-2(3x+2)=0(5x-2)(3x+2)=0x1=2/5x2=-2/3
①X²-3X+1=0x²-3x=-1x²-3x+(3/2)²=-1+9/4(x+3/2)²=5/4x+3/2=±(√5)/2x=(-3+√5)/2或x
2x(5x-1)=3(5x-1)2x(5x-1)-3(5x-1)=0(5x-1)(2x-3)=05x-1=0或2x-3=0得x=1/5或x=3/2如还不明白,请继续追问.手机提问的朋友在客户端右上角评
4x-60x+3x*x=5x-140x+7x*x4x*x-79x=0x(4x-79)=0x=0或x=79/4
3X(X-5)=(X-5)²3x(x-5)-(x-5)²=0[3x-(x-5)](x-5)=0(2x+5)(x-5)=0x=-5/2或x=5再问:3X²-5X=4公式法再
4x/5+3=x;x/5=3;x=15;
5x-30=3x+62x=36x=18
x²-2xy+y²/x²-y²=(x-y)²/(x-y)(x+y)=(x-y)/(x+y)因为x=3,y=-5,所以(3-(-5))/(3+(-5))
y1=-x+3,y2=3x-5因为y1>y2所以-x+3>3x-54x
哥!你那个是x方y方吧!有这么个公式x方-y方=(x+y)(x-y)所以得到了(x+y)(x-y)-(x+y)这时候提取公因式(x+y)就得到了(x+y)(x-y-1)再问:是啊,怎么提(X+Y)他那
x2+4x+y2-2y+5=0,x2+4x+4+y2-2y+1=0,(x+2)2+(y-1)2=0,x+2=0,y-1=0,解得x=-2,y=1,x2+y2=5,故答案为:5.
y1=y22x+1=5x+16-3x=15x=-5y1>y22x+1>5x+16-3x>15x>-5y1