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e)(3x-5)²-(5-3x)²=9x²-30x+25-25+30x-9x²=0
f)(0,2a-0,1b)²-(0,1a -0,2b)²=0,04a²-0,04ab+0,02b²-0,01a²+0,04ab-0,04b²=
0,03a²-0,02b²