Oblicz wartości liczbowe sum (najpierw zredukuj wyrazy podobne):
a) 2a+3-a+6+7a dla a=-2
b)2z+t-3z+4t-1 dla z=5 i t = 0,1
c)13x-2y+7-9x+y-4+x-3 dla x=0,2 i y=-1
d)n²+n-7+3n²-n-9-n+16 dla n=-½
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a) 2a + 3 - a + 6 + 7a = 8a + 9 = 8 * (-2) + 9 = -7
b) 2z + t - 3z + 4t - 1 = 5t - z - 1 = 5 * 0.1 - 5 - 1 = -5.5
c) 13x - 2y + 7 - 9x + y - 4 + x - 3 = 5x - y = 5 * 0.2 -(-1) = 2
d) n² + n - 7 + 3n² - n - 9 - n + 16 = 4n² - n = 4*(-0.5)² -(-0.5) = 1.5
a)![2a+3-a+6+7a=8a+9=8*(-2)+9=-16+9=-7 2a+3-a+6+7a=8a+9=8*(-2)+9=-16+9=-7](https://tex.z-dn.net/?f=2a%2B3-a%2B6%2B7a%3D8a%2B9%3D8%2A%28-2%29%2B9%3D-16%2B9%3D-7)
b)![2z+t-3z+4t-1=-z+5t-1=-5+5*0,1-1=\\ -5+0,5-1=-5,5 2z+t-3z+4t-1=-z+5t-1=-5+5*0,1-1=\\ -5+0,5-1=-5,5](https://tex.z-dn.net/?f=2z%2Bt-3z%2B4t-1%3D-z%2B5t-1%3D-5%2B5%2A0%2C1-1%3D%5C%5C+-5%2B0%2C5-1%3D-5%2C5+)
c)![13x-2y+7-9x+y-4+x-3=5x-y=5*0,2-(-1)=\\ 1+1=2 13x-2y+7-9x+y-4+x-3=5x-y=5*0,2-(-1)=\\ 1+1=2](https://tex.z-dn.net/?f=13x-2y%2B7-9x%2By-4%2Bx-3%3D5x-y%3D5%2A0%2C2-%28-1%29%3D%5C%5C+1%2B1%3D2)
d)![n^2+n-7+3n^2-n-9-n+16=4n^2-n=4*(-\frac{1}{2})^2-(-\frac{1}{2})\\ =4*\frac{1}{4}+\frac{1}{2}=2+\frac{1}{2}=1\frac{1}{2} n^2+n-7+3n^2-n-9-n+16=4n^2-n=4*(-\frac{1}{2})^2-(-\frac{1}{2})\\ =4*\frac{1}{4}+\frac{1}{2}=2+\frac{1}{2}=1\frac{1}{2}](https://tex.z-dn.net/?f=n%5E2%2Bn-7%2B3n%5E2-n-9-n%2B16%3D4n%5E2-n%3D4%2A%28-%5Cfrac%7B1%7D%7B2%7D%29%5E2-%28-%5Cfrac%7B1%7D%7B2%7D%29%5C%5C+%3D4%2A%5Cfrac%7B1%7D%7B4%7D%2B%5Cfrac%7B1%7D%7B2%7D%3D2%2B%5Cfrac%7B1%7D%7B2%7D%3D1%5Cfrac%7B1%7D%7B2%7D)