Question

接下列一元二次方程：如：3x^2-10x+3=0x=-(-10)±√(-10)^2-4x3x3/2X3x=10±√100

Answer 1

x^2-3x+2=0,

x=-(-3)±√(-3)^2-4x2x1/2X1

x=3±√1/2

x=3±1/2

x1=3+1/2=2

x2=3-1/2=1

5x^2-x-6=0,

x=-(-1)±√(-1)^2-4x5x(-6)/2X5

x=1±√121/10

x=1±11/10

x1=1+11/10=6/5

x2=1-11/10=-1

4x^2-4x+1=0

x=-(-4)±√(-4)^2-4x4x1/2X4

x=4±√0/8

x=4±0/8

x1=x2=4±0/8=1/2