jade5 0,3250等于几
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1,3250等于几
2,x2x50解答步骤
x2-x+5≤0
x2-x+1/4+19/4≤0
(x-1/2)2+19/4≤0
(x-1/2)2≥0,x是无解的
3,解方程 X24X50
x2-4x-5=0(x+1)(x-5)=0x=-1 或 x=5
4,解不等式 x24x50
x2-4x+5<0 x2-4x+4+1<0(x-2)2< -1无解解不等式-x平方+4x+5<0不等式变为 x^2-4x-5>0(x-5)(x+1)>0解得 x>5或x<-1
5,5x2x1x2x0 怎么做
5/x(x+1)-1/x(x-1)=0两边乘x(x+1)(x-1)5x-5-x-1=04x=6x=3/2经检验,x=3/2是方程的解(x-1)^2+2x(x-1)=0(x-1)(x-1+2x)=0(x-1)(3x-1)=0x=1或x=1/3
6,m2150 m
m^m-5m-1=0 m^m=5x=1 5m+1/m^m= =(5m+1)/(5m+1)=1m2-5m-1=0 m2-5m=1 两边除以m m-5-1/m=0 m-1/m=5 2m2-5m+1/m2 =m2-5m+m2+1/m2 =1+(m-1/m)2+2 =3+25 =28
7,若xy5xy620求x2y2的值要详细步骤啊
由于绝对值|x+y-5|≥0与(xy-6)^2≥0要使它们的和等于0则应有x+y-5=0且xy-6=0所以由x+y-5=0,xy-6=0可解得x=2,y=3或x=3,y=2于是x^2+y^2=13。两个数的平方和为零,则这两个数都为零 则有x+y-5=0 xy-6=0 得:x+y=5,xy=6 ∴(x+y)^2-2xy=25-12=13|x+y-5|+(xy-6)2=0x+y-5=0,xy-6=0x+y=5xy=6x2+y2=(x+y)^2-2xy=25-2*6=13
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jade5 3250等于几 3250 等于