一道GRE 求指导A border of uniform width is placed around a rectan
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一道GRE 求指导
A border of uniform width is placed around a rectangular photograph that measures 8 inches by 10 inches.If the area of the border is 144 square inches,what is the width of the border,in inches?
A border of uniform width is placed around a rectangular photograph that measures 8 inches by 10 inches.If the area of the border is 144 square inches,what is the width of the border,in inches?
设 the width of the border is x inches
then (2x+10)(2x+8)-8*10=144
解出 x=3 or x=-12
这里显然 x 只能等于3
then (2x+10)(2x+8)-8*10=144
解出 x=3 or x=-12
这里显然 x 只能等于3
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