都要公式法-1/2 x^2-3x+6=0x^2=2(x+1)4y^2 -(√2+8)y+ √2=00.09y^2-0.2
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/10/02 17:33:44
都要公式法
-1/2 x^2-3x+6=0
x^2=2(x+1)
4y^2 -(√2+8)y+ √2=0
0.09y^2-0.21y+0.1=0
-1/2 x^2-3x+6=0
x^2=2(x+1)
4y^2 -(√2+8)y+ √2=0
0.09y^2-0.21y+0.1=0
-1/2 x^2-3x+6=0
x²+6x-12=0
∴x=(-6±√84)/2
∴x=-3+√21 x=-3-√21
x^2=2(x+1)
x²-2x-1=0
∴x=(2±√8)/2
∴x=1+√2 x=1-√2
4y^2 -(√2+8)y+ √2=0
y=[(√2+8)±√(2+16√2+64-16√2)]/8
y =[(√2+8)±√66]/8
y=(√2+8+√66)/8 y=(√2+8-√66)/8
0.09y^2-0.21y+0.1=0
9y²-21y+10=0
∴y=[21±√(441-360)]/18
y=5/3 y=2/3
x²+6x-12=0
∴x=(-6±√84)/2
∴x=-3+√21 x=-3-√21
x^2=2(x+1)
x²-2x-1=0
∴x=(2±√8)/2
∴x=1+√2 x=1-√2
4y^2 -(√2+8)y+ √2=0
y=[(√2+8)±√(2+16√2+64-16√2)]/8
y =[(√2+8)±√66]/8
y=(√2+8+√66)/8 y=(√2+8-√66)/8
0.09y^2-0.21y+0.1=0
9y²-21y+10=0
∴y=[21±√(441-360)]/18
y=5/3 y=2/3
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
9y=3x-(x-1),4(x+y)-(2x+4)=8y
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6