请详解方程x²+2mx-3nx-3m²-mn+2n²=0
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请详解方程x²+2mx-3nx-3m²-mn+2n²=0
请详解方程x²+2mx-3nx-3m²-mn+2n²=0
请详解方程x²+2mx-3nx-3m²-mn+2n²=0
用十字相乘因式分解法解此方程.
x^2+2mx--3nx--3m^2--mn+2n^2=0
x^2+2mx--3nx--(3m^2+mn--2n^2)=0
x^2+2mx--3nx--(m+n)(3m--2n)=0
[x--(m+n)][x+(3m--2n)]=0
x1=m+n,x2=2n--3m.
解决方案:
×2 -4√2×8 = 0
A = 1,B = -4√2,C = 8
△= B 2-4AC
=( -4√2)2 -4×1×8
= 32-32
= 0
方程有两个相等的实数根
X1 = X2 =(-B±√△ )/(2a)的
=(4√2)/ 2
= 2√2
(2...
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解决方案:
×2 -4√2×8 = 0
A = 1,B = -4√2,C = 8
△= B 2-4AC
=( -4√2)2 -4×1×8
= 32-32
= 0
方程有两个相等的实数根
X1 = X2 =(-B±√△ )/(2a)的
=(4√2)/ 2
= 2√2
(2X-1)(X-3)= 4到通式 BR /> 2×2-7X +3 = 4
2×2-7X-1 = 0
1 = 2,B = -7,C = -1
△= B 2-4AC
=(-7)2 -4×2×(-1)
= 49 +8
= 57
X1 =(-B +√△)/(2A)
=(7 +√57)/ 4
X2 =(-B-√△)/(2A)
=(7 - √57)/ 4
> 4Y 2 - (√2 +8)Y +√2 = 0
A = 4,B = - (√2 +8),C =√2
△= B 2-4AC = [ - (√2 +8)] 2 -4×4×√2
= 2 +16√2 +64-16√2
= 66
Y1 =( - B +√△)/(2A)
=(√2 +8 +√66)/ 8
Y2 =(-B-√△)/(2A)
=(√2 +8√66)/ 8
√2×2 - √3倍√2 = 0
一=√2,B = - √3,C = - √2
>△= B 2-4AC
=( - √3)2 -4×√2×( - √2)
= 3 +8
= 11
X1 =( -B +√△)/(2a)的
=(√3 +√11)/(2√2)
=√2(√3 +√11)/(2√2×√2 )
=(√6 +√22)/ 4
X2 =(-B-√△)/(2A)
=(√3 - √11)/(2√2)
=(√6 - √22)/ 4
(Y-2)(y +1)的+ Y(Y-1)= 0代入通式
2-γ-2 + Y 2-Y = 0
2Y 2-2Y-2 = 0时,方程1/2
Y 2-Y-1 = 0
一个两边乘以为1,b = -1,C = -1
△= B 2-4AC
=(-1)2 -4×1×(-1)
= 1 4 = 5
Y1 =(-B +√△)/(2a)的
=(1 +√5)/ 2
Y2 =(-B-√△)/( 2A)
=(1 - √5)/ 2
×2 +2 MX-3 NX-3M 2-MN +2 n 2个= 0
×2 +(3219米-3N)×-3M 2亿2 2 = 0
A = 1,B = 2M-3N,C =-3M 2-MN +2 n 2个
△= B 2-4AC
=(2M-3N)2 -4×1×(-3M 2-MN +2 n 2个)
= 4平方米,1,200万+9 n 2个12平方米4 MN-8N 2 BR /> = 16立方米,800万+ N 2
=(4M-N)2
△=(4M-N)2≥0
√△= | 400万-N | 当△> 0时,4M-N≠0,M≠N / 4时,方程有不等
X1两个实根=(-B +√△)/(2A)
= (-2M +3 N + | 400万-N |)/ 2
X2 =(-B-√△)/(2A)
=(-2M +3 N-| 400万-N |) / 2
当△= 0时,4M-N = 0,M = N / 4时,方程有两个相等的实数根
X1 = X2 =(-B±√△)/(2A)
=(-2M +3 N)/ 2
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