Matemática, me ajudem!?

a) 7x²+2x²-6x²

b) 20xy-17xy-5xy

c) 2ab+1,5ab-2,3ab

d) -3,1x²y+4,5x²y-2,7x²y

Comments

  • a) x²*(7 + 2 - 6) = 3x²

    b) xy*(20 - 17 - 5) = -2xy

    c) ab*(2 + 1,5 - 2,3) = 1,2ab

    d) x²y*(-3,1 + 4,5 - 2,7) = -1,3x²y

    pronto

  • a) 3x²

    b) -2xy

    c) 1,2ab

    d) -1,3x²y

  • x²(7+2-6)=3x²

    b)xy(20-17-5)=-2xy

    Continue...

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