AMC英文数学竞赛题,.A rectangular region is bounded by the graphs of the equations y=a,y=-b,x=-c,and x=d,where a,b,c,and d are all positive numbers.Which of the following represents the area of this region?(A) ac + ad + bc + bd (B) ac – ad +

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AMC英文数学竞赛题,.A rectangular region is bounded by the graphs of the equations y=a,y=-b,x=-c,and x=d,where a,b,c,and d are all positive numbers.Which of the following represents the area of this region?(A) ac + ad + bc + bd (B) ac – ad +
AMC英文数学竞赛题,
.A rectangular region is bounded by the graphs of the equations y=a,y=-b,x=-c,and x=d,where a,b,c,and d are all positive numbers.Which of the following represents the area of this region?
(A) ac + ad + bc + bd (B) ac – ad + bc – bd (C) ac + ad – bc – bd (D) –ac –ad + bc + bd (E) ac – ad – bc + bd

AMC英文数学竞赛题,.A rectangular region is bounded by the graphs of the equations y=a,y=-b,x=-c,and x=d,where a,b,c,and d are all positive numbers.Which of the following represents the area of this region?(A) ac + ad + bc + bd (B) ac – ad +
答案应该是A吧!就是求面积呀!

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