If one side of a parallelogram is extended by a centimeter, the height remains unchanged at 4 centimeters, and the area of the resulting figure increases by ____ square centimeters compared to the area of the original parallelogram. how much a
一个平行四边形的一条延长a厘米，高不变仍然是4厘米，所得图形的面积比原来平行四边形的面积增加____平方厘米．多少a
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