Oblicz:
a)
x= 3
y= 1
b)
y= -3
a)2(9-18+9)-3(3-2)(3+2)+36=0-15+36=21
b)(108+81)-3(12-9)-81=189-9-81=99
y= 12x² - 12xy + 18y² - 3(x² - 4y²) + 12xy = 2x² - 12xy + 18y² - 3x² + 14y² + 12xy = 2×3² -12×3 + 18 - 3×3² + 14 +12×3 = 2×9 - 36 + 18 - 3×9 +14 +36 = 18 - 36 +18 - 27 +14 + 36 = 23
y= -3[(-12)×3×(-3) +9×(-3)²] - 4x² - 3xy - 9y² = (108 + 81) - 4×3² - 3×3×(-3) - 9(-3)² = 189 - 36 +27 - 81 = 99
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a)2(9-18+9)-3(3-2)(3+2)+36=0-15+36=21
b)(108+81)-3(12-9)-81=189-9-81=99
a)
x= 3
y= 1
2x² - 12xy + 18y² - 3(x² - 4y²) + 12xy = 2x² - 12xy + 18y² - 3x² + 14y² + 12xy = 2×3² -12×3 + 18 - 3×3² + 14 +12×3 = 2×9 - 36 + 18 - 3×9 +14 +36 = 18 - 36 +18 - 27 +14 + 36 = 23
b)
x= 3
y= -3
[(-12)×3×(-3) +9×(-3)²] - 4x² - 3xy - 9y² = (108 + 81) - 4×3² - 3×3×(-3) - 9(-3)² = 189 - 36 +27 - 81 = 99