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5/2 + 4/3 ÷ 5/4
5/2 + 4/3 × 4/5
5/2 + 4×4/3×5
5/2 + 16/15
5×15/2×15 + 16×2/15×2
75/30 + 32/30
107/30
2. 2 1/4 × (- 1 1/2) × 0,5
9/4 × (-3/2) × 5/10
9×-3×5/4×2×10
-135÷5/80÷5
-27/16
-1 11/16