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在梯形的面积公式S = ( a + b ) h中，若S = 16，b = 5,h = 4, 则a = 。
在梯形的面积公式S = ( a + b ) h中，若S = 16，b =" 5,h" =" 4," 则a = 。
(
a + b ) h中，若S = 16，b = 5,h = 4,
则a = 。
( a + b ) h中，若S = 16，b =" 5,h" =" 4," 则a = 。
( a + b ) h中，若S = 16，b =" 5,h" =" 4," 则a = 。