(30-X)(20-X)=551怎么解?

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(30-X)(20-X)=551怎么解?(30-X)(20-X)=551怎么解?(30-X)(20-X)=551怎么解?(30-X)(20-X)=551X²-50X+600=551X

(30-X)(20-X)=551怎么解?
(30-X)(20-X)=551怎么解?

(30-X)(20-X)=551怎么解?
(30-X)(20-X)=551
X² - 50X + 600 = 551
X² - 50X + 49 = 0
(X - 1)(X - 49) = 0
X = 1 或 X = 49