Question

一道数学题求帮助0.2x^2-1.2x+0.55=0

Answer 1

0.2x^2-1.2x+0.55=0

x^2-6x+2.75=0

x^2-6x+9-9+2.75=0

(x-3)^2=6.25

x-3=±2.5

x=3+2.5=5.5

或x=3-2.5=0.5

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