2x平方-8x 32=0
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x平方-8x+16=4x²-8x+16=4x²-8x+12=0﹙x-2﹚﹙x-6﹚=0x₁=2.x₂=6x平方+5x-3=0x²+5x-3=0x&
把25拆成16+9(x²-8x+16)+(y²+6y+9)=0(x-4)²+(y+3)²=0平方大于等于0,相加等于0若有一个大于0,则另一个小于0,不成立.所
(2x+1)平方-2x=14x²+2x=02x(2x+1)=0x=0或x=-1/24x平方=x+94x²-x+1/4=37/4(2x-1/2)²=37/42x-1/2=√
35分之8x32分之5+35分之5x32分之27=5/35x8/32+5/35x27/32=5/35x(8/32+27/32)=5/35x35/32=5/32
x^2+3x+1=0x+1/x=-32x^2+2/x^2=2[(x+1/x)^2]-4=2*9-4=14
8^x*32^y=2^3x*2^5y=2^(3x+5y)=2^3=8
X²-XY+2X=O提公因数X即X(X-Y+2)=0则X=0或X-Y+2=0假如X=0那么代入X²-2XY+Y+8=0解得Y=﹣8即X=0Y=﹣8假如X≠0则X-Y+2=0即X=Y
1)不是很清楚,sorry.2)2+5y=3,4^x*32^y=2^2x+2^5y=2^(2x+5y)=2?=83)ThetwinswereborninBritain,weren'tthey?4)Wh
3x²+2x²-3x-(-x+5x²)=3x²+2x²-3x+x-5x²=-2x其中x=314时,-2x=-2*314=-6285xy-8x
(-56)x(-32)+(-44)x32=56x32-44x32=(56-44)x32=12x32=384
4^(x-1)*32^(y)=(2^2)^(x-1)*(2^5)^y=2^(2x-2)*2^5y=2^(2x+5y-2)=2^(2x+5y-3)*2=2^0*2=1*2=2
15x平方-18x+9-(-3x平方+19x-31)-8x=18x²-45x+40=9(2x²-5x+5)-5=9×0-5=-5
令y=x2-8,则原方程转化为(y+2x)(y-13x)+(y+11x)(y-13x)+(y+11x)(y+2x)=0.整理得y2-49x2=0,(y+7x)(y-7x)=0.所以y1=-7x,y2=
(42+58)×32.乘法分配律.a×b+a×c=a×(b+c).
(x^2-2x)^2-5(x^2-2x)-6=(x^2-2x-6)(x^2-2x+1)=(x^2-2x-6)(x-1)^2=0所以x-1=0或者x^2-2x-6=0x^2-2x-6=0x^2-2x+1
(x平方+x)平方-3x平方-3x+2=0(x²+x)²-3(x²+x)+2=0令x²+x=A,则原方程可化为A²-3A+2=0(A-1)(A-2)=
20X+32Xx2-4X²=20x32-57084X-4X²=704X²-84X+70=0X=(21+√371)/2或X==(21-√371)/2
好吧建议你复习下初三课本
(3x²-x-2)²=(2x²+4x-8)²-(x²-5x+6)²(3x²-x-2)²=[(2x²+4x-8)
x^2-2=0x^2=2原式=x^2-2x+1+x^2/x+2=2-2x+1+2/x+2=(2x+4-2x^2-4x+x+2+2)/x+2=(2x+4-4-4x+x+2+2)/(x+2)=4-x/x+