Question

67+{50.[70÷(27+8)+18÷2]+21}

Answer 1

67+{50.[70÷35+18÷2]+21}
67+{50.[2+9]+21}
67+{50.11+21}
67+{550+21}
67+571=638

Answer 2

 Vamos lá.

67 + {50 . [70 : (27 + 8) + 18 : 2] + 21}

67 + {50 . [70 : 35 + 9] + 21}

67 + {50 . 2 + 9 + 21}

67 + {50 . 11 + 21}

67 + 550 + 21

638.

Bons estudos.