1. a, b, c- натуральные числа.
а:b:c=4 : 5:7 c^2 - b^2 - a^2 = 32, a+b+c=?
а:b:c=4 : 5:7 c^2 - b^2 - a^2 = 32, a+b+c=?
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a : b : c = 4x : 5x : 7x
c² - b² - a² = 32
49x² - 25x² - 16x² = 32
8x² = 32
x² = 4
x1 = 2 , x2 = -2
a + b + c = 4 * 2 + 5 * 2 + 7 * 2 = 32
a + b + c = 4 * -2 + 5 * -2 + 7 * -2 = -32