1. Oblicz f (-2,3), jeśli: a) f (a, b ) = 3a - 5b -7 [(2a - b) - (b - 2a)] b) f (a, b) = 9a - (5a - 2b) + 3[1 + 7(a - b) - 4b]
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a)f(-2,3)=3(-2)-5x3-7[(2(-2)-3)-(3-2(-2)]=-6-15-7[-4-3-3-4]=-28[-14]=392
b)f(-2,3)=9(-2)-(5(-2)-2x3)+3[1+7(-2-3)-4x3]=-18-(-10-6)+3[8(-5)-12]=-18+16+3[-52] =-2-156=-158