Răspuns :
Răspuns:
a)
[tex] (4\frac{3}{5} - 2 \frac{1}{5} ) \times \frac{5}{7} + 3 = \\ =(4 - 2 + \frac{3 - 1}{5} ) \times \frac{5}{7} + 3 = \\ = 2 \frac{2}{5} \times \frac{5}{7} + 3 = \\ = \frac{12}{5} \times \frac{5}{7} + 3 = \\ = \frac{12}{7} + 3 = 3 \frac{12}{7} [/tex]
b)
[tex] ({ \frac{4}{5} })^{2} \times \frac{20}{8} - \frac{9}{5} \div 3 \frac{6}{10} + \frac{1}{10} = \\ = \frac{16}{25} \times \frac{5}{2} - \frac{9}{5} \times \frac{10}{36} + \frac{1}{10} = \\ = \frac{8}{5}- \frac{2}{4} + \frac{1}{10} = \\ = \frac{(8 \times 4) - (2 \times 5) + (1 \times 2)}{20} = \\ = \frac{32 - 10 + 2}{20} = \\ = \frac{24}{20} = 1 \frac{1}{5} [/tex]
c nu ai formulat corect .. scrie în com și răspund
d )
[tex]34\%din150 \\ \frac{34}{100} \times 150 = \frac{34 \times 3}{2} = 17 \times 3 = 51[/tex]
problema
[tex]((850 \times \frac{7}{10} ) \times \frac{2}{5} ) - 200 = \\ =( (85 \times 7) \times \frac{2}{5} ) - 200 = \\ = (\frac{85 \times 7}{1} \times \frac{2}{5}) - 200 = \\ = (17 \times 7 \times 2) - 200 = \\ = 238 - 200 = 38[/tex]