Question

Alguém me ajuda , por favor !

Answer 1

A=14x²y-{5xy²+[12xy²-8x²y-(3xy²-4x²y)]-12x²y}

14x²y-{5xy²+[12xy²-8x²y-3xy²+4x²y)]-12x²y}

14x²y-{5xy²+[9xy²-4x²y]-12x²y}

14x²y-{5xy²+9xy²-4x²y-12x²y}

14x²y-{14xy²-16x²y}

14x²y-14xy²+16x²y

30x²y-14xy²