Matematică, întrebare adresată de jfkhfjnsdfksdfj, 9 ani în urmă

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Răspuns de Nico234679ghd
2

m \: a = 32  \frac{1}{2}  \\ m \: a =  \frac{65}{2}  \\  \\ (a + b) \div 2 = 17  \frac{1}{2}  \\ (a + b)  \div 2 =  \frac{35}{2}  \\ a = 75\% \times b \\ a =  \frac{75}{100}  \times b \\ a = 25\% \times d \\ ( \frac{75}{100}  \times b + b) \div 2 =  \frac{35}{2}  \\ ( \frac{3}{4} b + b) \div 2 =  \frac{35}{2}  \\  \frac{7}{4} b \div 2 =  \frac{35}{2}  \\  \frac{7}{4}  \times  \frac{b}{2}  =  \frac{35}{2}  \\  \frac{7}{8} b =  \frac{35}{2}  \\ 14b = 280 \\ b = 280 \div 14 \\ b = 20 \\ a =  \frac{75}{100}  \times 20 \\ a = 15 \\ a =  \frac{25}{100}  \times d \\ 15 =  \frac{25}{100}  \times d \\ d = 60 \\ (a + b + c + d) \div 4 =  \frac{65}{2}  \\ (15 + 20 + c + 60) \div 4 =  \frac{65}{2}  \\ 15 + 20 +  c + 60 =  \frac{65}{2}  \times 4\\ 15 + 20 + c + 60 = 130 \\ c = 130 - 15 - 20 - 60 \\ c = 35
(x + y + z) \div 3 = 46  \frac{2}{3}  \\ (x + y + z) \div 3 =  \frac{140}{3}  \\ z = 25\% \times y \\ z =  \frac{25}{100}  \times y \\ y = 60\% \times x \\ y =  \frac{60}{100}  \times x \\ z =  \frac{25}{100}  \times ( \frac{60}{100}  \times x) \\ z =  \frac{3}{20} x \\ (x +  \frac{60}{100}  \times x +  \frac{3}{20} x ) \div 3=  \frac{140}{3}  \\ x +  \frac{3}{5}  \times  +  \frac{3}{20} x =  \frac{140}{3}   \times  3 \\  \frac{60x + 36x + 9x}{60}  =  140 \\  \frac{150x}{60}  = 140 \\ x = 140  \times   \frac{60}{105}  \\ x = 80 \\ y =  \frac{60}{100}  \times 80 \\ y = 48 \\ z =  \frac{25}{100}  \times 48 \\ z = 12

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