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No. 72 jawabannya x+y ≤ 25; 3x+4y ≤ 84; x≥0; y≥0 (c)
No.73 jawabannya pada daerah yang ke II (b)
No. 74 jawabannya 5x+3y≤30; x-2y≤4 (b)
Jawaban terbaik yaa :) sankyuu