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)
b)
c)
d)