125. x(8−x)
126. x(21−x)
127. 4x(18−x)(8−x)
128. 4(12−x)(12+x)
129. π(2−x)(2+x)
130. 8π(x−3)(x+3)
131. 2x(1400−x)
132. 14x(96−πx)
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