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(xy² - 7xy² + x²y - 7xy) - (x²y² - 3x²y + xy²)
= xy²(1-7) + x²y - 7xy - x²y² + 3x²y + xy²
= -6xy² + x²y - 7xy - x²y² + 3x²y + xy²
Temukan sekawannya:
= -x²y² + x²y + 3x²y + xy² - 6xy² - 7xy
= -x²y² + 4x²y - 5xy² - 7xy
Susun ulang:
= 4x²y - 5xy² - 7xy - x²y²
Atau:
= xy(4x - 5y - 7 - xy)
xy^2 - xy^2 - 7xy^2 +x^2y - 3x^2y -7xy - x^2 y^2=
-7xy^2 -2 x^2y -7xy - x^2y^2