[tex]18 \div (2 \frac{3}{9} + 1 \frac{6}{9} ) + 2.5 \times 0.4 = \\ = 18 \div 4 + 1 = 4.5 + 1 = 5.5[/tex]
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[tex]18 \div (2 \frac{3}{9} + 1 \frac{6}{9} ) + 2.5 \times 0.4 = \\ = 18 \div 4 + 1 = 4.5 + 1 = 5.5[/tex]