wykonaj działania:
a) (8x²+6xy-12xy²)-(10xy² + 8²y + 7xy)
b) (4x²y² + 7xy²) - (3xy + 13xy²) - (5x²y² + 5xy) + x²y²
c) (x4 - [3x³ - x² - (2x4 - 2x³ + 4x²) - 5x³] - 5x²
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a) (8x²+6xy-12xy²)-(10xy² + 8x²y + 7xy)
8x²+6xy-12xy²-10xy² - 8x²y - 7xy=8x²-xy-22xy²- 8x²y
b) (4x²y² + 7xy²) - (3xy + 13xy²) - (5x²y² + 5xy) + x²y²
4x²y² + 7xy² - 3xy - 13xy² - 5x²y² - 5xy + x²y²
=-6xy²- 8xy
c) x4 - 3x³ + x² - 2x4 + 2x³ - 4x² - 5x³ - 5x²
-x4-6x³-8x²