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1000г/250г=4
4*45=180руб
1000г/200г=5
39*5=195руб
1000г/300г=10/3
10/3*54=180руб
1000г/200г=5
5*62=310руб
1) mx+my-mc=m(x+y-c)
2) 14y-8my=2y(7-4m)
√x - x = - 12
√x = x - 12
x = (x - 12)²
x = ( x - 12)(x - 12)
x = x² - 24x + 144
- x² + 25x - 144 = 0
x² - 25x + 144 = 0
D = b² - 4ac = 625 - 4 × 144 = 625 - 576 = 49 = 7²
x1 = ( 25 + 7) / 2 = 16
x2 = ( 25 - 7) / 2 = 9