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A school is going to build a rectangular bicycle shed in the field behind the library.
Solution: (1)S=x(2/28-x)

S=- 1/2x？ + 14x

(2)∵S=- 1/2x？ + 14x

∴ When S= 100,-1/2x? + 14x= 100

Namely: x? -28x+200=0

∫a = 1，b=-28，c=200

b？ -4ac

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