Oblicz wartości wyrażenia dla: x = - 3/4 i y = 1/3
a) 2x do potęgi 2 - 4 pod kreska 15xy =
b) 15xy - 2x do potęgi 2 pod kreska 3y do potęgi 2
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a) 2x(2) - 4 2* -3/4(2) -4 2-1 * -9/16 -4/1 - 9/8 - 4/1 - 9/8 - 32/8
__________ = ___________ = ______________ = ___________ = __________ =
15 xy 15*3/4 * 1/3 15/1*3/4*1/3 15/4 15/4
-41/8
= _______ = - 41/8 : 15/4 = - 41/8 * 4/15 = -41/30 = 1 11/30.
15/4
b) 15 xy - 2x(2) 15* -3/4 * 1/3 - 2 * -3/4(2) 15/1 * 3/4 * 1/3 - 2/1 + 9/16
____________ = ________________________ = _________________________ =
3y(2) 3 * 1/3(2) 3/1 * 1/9
15/4 - 32/16 + 9/16 15/4 - 41/16 60/16 - 41/16 19/16
= __________________ = ___________ = _____________ = ______ = 19/16 = 1 3/16
1 1 1 1