3分之x-2-≥4分之2x 1-搜答案-百度作业网

(2x-y)/(x+3y)=2所以原式=2(2x-y)/(x+3y)-3(x+4y)/(2x-y)=2(2x-y)/(x+3y)-3/[(2x-y)/(x+3y)]=2×2-3/2=5/2

5分之3x-7＜2分之x-23X/5-7

x-4分之1=5分之3x=1/4+3/5x=17/208分之3+X=12分之11x=11/12-3/8x=13/24X-5分之2-7分之2=5分之3x=3/5+2/5+2/7x=1又2/7在右上角点击

x²－4x＋2＝0由韦达定理得：x1＋x2＝4,x1·x2＝2∴(1)x1+x2+3x1x2=4+3*2=10(2)x2/x1+x1/x2=(x2²+x1²)/x1x2=

X1＋X2=-B/A=2X1*X2=C/A=1/2求得X1=1+根号2或者X1=1-根号2从而求出X2的值X1/X2+X2/X1=(X1*X1+X2*X2)/(X1X2)=6

1+2x＞3+x和5x≤4x-12-x≤-1和3＜x-13（x-1）＜4x-2和5分之-x＞2分之x+12分之1+3分之2x≤2分之-x+3分之5和3（x-1）＜x-52分之1（x+3）＜2和2分之x

2x/3=x²/12+3/x²+4/xx²/12+3/x²=2x/3-4/xx²/4+9/x²=2x-12/x(x/2-3/x)²

设x1,x2是方程2x平方+4x-3=0的两个根,则x1+x2=-2x1·x2=-3/2∴x1平方+x2平方=(x1+x2)²-2x1·x2=(-2)²-2×(-3/2)=4+3=

利用x1+X2=-B/A,x1x2=C/A(1)1/x1+1/x2=(x1+x2)/x1x2=-(-6/2)/(3/2)=-2(2)在菱形ABCD中边长是5,所以有OA^2+OB^2=5^2=25OA

你的题目是我图片里写的那样吗?

[(x-2)分之3x-(x+2)分之x]乘x分之(x²-4)=[(x-2)分之3x]乘x分之(x²-4)-[(x+2)分之x]乘x分之(x²-4)=3(x+2)-(x-2

x/4+0.75x=1/82x+0.75=12x=0.25x=0.1254（x+0.2）=1.24x=1.2-0.84x=0.4x=0.15x-1/3=2/315x-1=215x=3x=0.2可以重新

X1+X2=3/2X1*X2=-5/2(1)1/X1+1/X2=(X1+X2)/X1*X2=-3/5(2)x1²+x2²=(X1+X2)²-2*X1*X2=29/4(3)

（x²-1）/x=3/2x²-1-3/2x=02x²-3x-2=0十字相乘x=-1/2或者x=2

（1）解是x1等于a,x2等于a分之2（2）在方程x+X分之2=a+a分之2两边同时乘以ax,得出a乘以(x的平方)+2a=（a的平方）乘以x+2x,移项后得到a乘以(x的平方)-（a的平方+2）乘以

2√2－2或－2√2－2

x1+x2=-3/2x1x2=-21/x1+1/x2=（x1+x2)/x1x2=(-3/2)/(-2)=3/4x1²+x2²=(x1+x2)²-2x1x2=(-3/2)&

X1+X2=-6/2=-3X1*X2=-3/21/X1+1/X2=(X1+X2)/(X1X2)=-3/(-3/2)=2

x1+x2=4x1x2=-1(x1+x2)^2/(1/x1+1/x2)=(x1+x2)^2*x1x2/(x1+x2)=x1x2*(x1+x2)=-4