直线(2a^2-7a 3)x (a^2-9)y 3a^2=0
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直线L方程是x+2y+4=0就按这个解答.两式联立,可求得它们的交点坐标为P(4,-4),在直线a上取点A(0,4),设A关于直线L的对称点A1(a,b),则(1)AA1丄L,可得(b-4)/a=2;
a+2=-4.===>a=-6.
a=3直线与x轴重合,当a=0.5时,直线与x轴平行
a³-2a²-a+7=5a³-2a²-a+2=0(a³-a)+(-2a²+2)=0a(a²-1)-2(a²-1)=0(a
|a1|+|a2|+|a3|+…+|an|=2+4+6+…+2n-14n=2(1+2+3…+n)-14n=(n+1)(n+2)-14n=n^2-11n+2求两直线交点,解方程组ax-2y=2a-42x
令x=1,则(2x-1)7=a7x7+a6x6+…+a1x+a0=a0+a1+a2+a3+a4+a5+a6+a7=1.
(a²+7a+10/a²-a+1)*(a3+1/a²+4a+4)÷(a+1/a+2)=[(a+2)(a+5)/(a²-a+1)]*[(a+1)(a²-
x^2-(2a+1)x+a^2+a-2=x^2-(2a+1)x+(a+2)(a-1)=(x-a-2)(x-a+1)>0得x>a+2或x
将x=a代入方程x2+x-1=0,得:a2+a-1=0,则a2=1-a,a2+a=1故a3-2a+2016=a•a2-2a+2016=a(1-a)-2a+2016=a-a2-2a+2016=-(a2+
直线ax+2y+3a=0和直线3x+(a-1)y=a-7平行的充要条件是a*(a-1)-2*3=0a^2-a-6=0(a-3)(a+2)=0a=3或-2当a=-2时,二个直线分别是x-y+3=0和x-
两条直线平行,斜率相等ax+2y+30=0,斜率k1=-a/2,3x+(a-1)y+7-a=0,斜率k2=-3/(a-1)a/2=3/(a-1),a^2-a-6=0,a1=-2,a2=3
(2+x)^5=a0+a1(x-1)+a2(x-1)^2+a3(x-1)^3+a4(x-1)^4+a5(x-1)^5令x-1=1,即x=2得4^5=a0+a1+a2+a3+a4+a5=1024令x-1
乘出来:(1.0x^7)+(4.0x^6)+(8.0x^5)+(13.0x^4)+(17.0x^3)+(14.0x^2)+(6.0x^1)+(1.0x^0)加起来208
∵a²=3a-1∴原式=a*a²-2a²+2a+1=a(3a-1)-2(3a-1)+2a+1=3a²-a-6a+2+2a+1=3(3a-1)-5a+3=9a-3
方程两边同时乘以6得:4kx+2a=12+x-bk,(4k-1)x+2a+bk-12=0①,∵无论为k何值时,它的根总是1,∴把x=1代入①,4k-1+2a+bk-12=0,则当k=0,k=1时,可得
a³-2a²-4a+3=a³-2a²-3a-a+3=a(a²-2a-3)-(a-3)=a(a+1)(a-3)-(a-3)=(a-3)(a²+
两方程联立,解得它们的交点为A(8/3,-4/3).在直线a上取点B(0,4),设B关于直线L的对称点为B1(a,b),则(1)BB1丄L:(b-4)/(a-0)=2,----------①(2)BB
原式=4a+3a2-3-3a3+a-4a3=-7a3+3a2+5a-3,当a=-2时,原式=56+12-10-3=55.
a3-a2+a2-3a+2不等于0a2(a-1)+(a-1)(a-2)不等于0(a-1)(a2+a-2)不等于0(a-1)的平方乘以(a-2)不等于0a不等于1和-2
2x-a3+2b-1