resolva os problemas, matematica?

igor-moroigor-moro
in Science & Mathematics

A) se A=(x+2)² e B=(x-2)², calcule A-B

B) dados A=3x+2y e B=3x-2y, determine A²-B²

C) se A=(1+a)², B=(1+a)(1-a) e C=(2a-1)², determine A-B+C

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