Ответы на вопрос:
0,3х - 0,4y = 0,1 ( • 10 ) 3x - 4y = 1 3x + 4y = - 13 3x + 3x - 4y + 4y = 1 - 13 6x = - 12 x = - 2 3•( -2 ) + 4y = - 13 4y = - 13 + 6 4y = - 7 y = - 1,75 ответ ( - 2 ; - 1,75 )
2+ 5 + 8 + + x = 1552 + (2 + 3 ) + ( 2 + 2(3)) + ( 2 + 3(3)) + + ( 2 + n(3)) = 155 2(n + 1) + 3(1 + 2 + .. + n) = 155 2(n + 1) + 3n(n+1)/2 = 155 4n + 4 + 3n2 + 3n = 310 3n^2 + 7n - 306 = 0 la solución positiva es n = 9 lo que nos da x = 2 + 3n = 29.
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