四x-1.2x-x=5点四怎么解方程
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将x变为公因数后,可化简为:
2x^2 - 2.2x - 5 = 0
将2x^2 - 2.2x = 5 化为一元二次方程的标准形式:
2x^2 - 2.2x + 0.45 = 0
令a=2, b=-2.2, c=0.45,则方程的根为:
x1 = (-b + sqrt(b^2 - 4ac))/2a
x2 = (-b - sqrt(b^2 - 4ac))/2a
即
x1 = (2.2 + sqrt(2.2^2 - 4*2*0.45))/4
x2 = (2.2 - sqrt(2.2^2 - 4*2*0.45))/4
结果:
x1 = 1.943
x2 = -1.143
2x^2 - 2.2x - 5 = 0
将2x^2 - 2.2x = 5 化为一元二次方程的标准形式:
2x^2 - 2.2x + 0.45 = 0
令a=2, b=-2.2, c=0.45,则方程的根为:
x1 = (-b + sqrt(b^2 - 4ac))/2a
x2 = (-b - sqrt(b^2 - 4ac))/2a
即
x1 = (2.2 + sqrt(2.2^2 - 4*2*0.45))/4
x2 = (2.2 - sqrt(2.2^2 - 4*2*0.45))/4
结果:
x1 = 1.943
x2 = -1.143
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