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n²+n-7+3n²-n-9-n+16=4n²-n=4*1/4+1/2=1+1/2=3/2
n2+n-7+3n2-n-9-n+16=4n2-n=4*(-1/2)2-(-1/2)=1+1/2=1 1/2
13x - 2y + 7 - 9x + y - 4 - 3 = 4x - y
4x - y = 4 * 0,2 - (-1) = 0,8 + 1 = 1,8
Dla n= - ½ = -1/2
n² + n -7 + 3n² - n - 9 - n + 16 = 4n² - n
4n² - n = 4 * (-1/2)² - (-1/2) = 4 * 1/4 + 1/2 = 1 + 1/2 = 1,5