方程x的平方-8x 7=0
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1.解方程8x-6x7=46.88x-42=46.88x=88.8x=11.12.解方程2x+4.5x6=512x+27=512x=24x=123.解方程1.6x+2.4x=10.44x=10.4x=
X²-2X-3=0(X-3)(X+1)=0X-3=0,X+1=0X=3,X=-1
4x-6x7.2=9.84x-43.2=9.84x=9.8+43.24x=53x=53÷4x=13.25
(4.5-x)x7=17.54.5-x=17.5÷7=2.5x=4.5-2.5x=2
8x^3-2x^2-3x=0,x(8x^2-2x-3)=0,x(2x+1)(4x-3)=0,x=0,2x+1=0,4x-3=0,x1=0,x2=-1/2,x3=3/4
X的平方-2X-1=0x=[2±√(2^2-4*1*(-1)]/2=(2±2√2)/2=1±√2x=1+√2或x=1-√2
2.7x+3=97.52.7x=97.5-3x=94.5÷2.7x=350.95÷0.4x=1.90.4x=0.95÷1.9x=0.5÷0.4x=1.256.8+x=24.5x=24.5-6.8x=1
x^2-|x|=0当x≥0,x^2-x=0x(x-1)=0x=0,x=1当x
2x²-7x=0x²-7/2+49/16=49/16(x-7/4)²=49/16x-7/4=+,—7/4x=0,x=7/8
两边除以5x²+x/5=1x²+x/5+1/100=1+1/100(x+1/10)²=101/100x+1/10=±√101/10x=(-1-√101)/10,x=(-1
4x^2(x+2)-9(x+2)=0(x+2)(4x^2-9)=0(x+2)(2x-3)(2x+3)=0x=-2,1.5,-1.5
0.9x-4X1.3=1.10.9x-5.2=1.10.9x=1.1+5.20.9x=6.3x=71.3X7=25.1-8x9.1=25.1-8x8x=25.1-9.18x=16x=24.8+0.5x
(3x²-x-2)²=(2x²+4x-8)²-(x²-5x+6)²(3x²-x-2)²=[(2x²+4x-8)
0.9x--4x1.3=1.10.9x-5.2=1.10.9x=6.3x=71.3x7=25.1-8x9.1=25.1-8x8x=16x=24.8+0.5x=6.30.5x=1.5x=3(25+2x)
49x的平方-25=0(7x+5)(7x-5)=0x=-5/7x=5/74x的平方=8x4x(x-2)=0x=0x=2(3x-2)的平方=(1-5x)的平方(3x-2+1-5x)(3x-2-1+5x)
48-X+3x7=3648-x+21=36-x=36-48-21-x=-33x=33