已知(x-1) 5*y-5x的立方根
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x+y=02x+1=0x=-0.5y=0.52(x+5y)=2*(-0.5+2.5)=4平方根=±2
1.x^4+5x^2-6=(x^2+6)(x^2-1)=(x^2+6)(x-1)(x+1)2.(x+y)(x+y+2xy)+(xy+1)(xy-1)=(x+y)^2+2xy(x+y)+(xy+1)(x
把x-y=-3y+5的左边移到右边:x-y+3y-5=0所以:x+2y-5=0x+2y-1=4
答:x+y=-1,xy=-2-5(x+y)+(x-y)+x(xy+y)=-5x-5y+x-y+xy(x+1)=-4x-6y+(-2)(x+1)=-4x-6y-2x-2=-6x-6y-2=-6(x+y)
(1)x>2→x-2>0.依基本不等式得y=(x^2+5)/(x-2)=[(x^2-4)+9]/(x-2)=(x-2)+9/(x-2)+4≥2√[(x-2)·9/(x-2)]+4=10.∴x-2=9/
参考不知道对不对x-y=6得x-y的平方=36x-y的平方等于x平方+y平方-2xy所以116--2xy=36所以-2xy=-80所以xy就等于40
可以得出x.x+y.y-6x-8y+25=x.x-6x+9+y.y-8y+16=(x-3).(x-3)+(y-4).(y-4)=0因为(x-3).(x-3)>=0,(y-4).(y-4)>=0所以x=
由4x+y-4x-6y+10=0得(4x-4x+1)+(y-6y+9)=0(2x-1)+(y-3)=0(2x-1)=0(y-3)=0x=1/2y=3代入所求算式即可求出结果(不好意思,看不清你的所求算
x+y=02x+1=0x=-0.5y=0.52(x+5y)=2*(-0.5+2.5)=4平方根=±2
(1)已知x+y=6,x²-y²=5,x^2-y^2=(x+y)(x-y)=5x-y=5/(x+y)=5/6(2)若x+y=3,x²+y²=5(x+y)^2=3
x-y=1,x+y=-73(x+y)+20(x-y)-5=3×(-7)+20×1-5=-21+20-5=-6
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