Question

O valor da expressão [✓81-(3 elevado a 3-7)×3+60]÷(3 elevado a 2-6) é:

Answer 1

$[\sqrt{81}-(3^3-7)\cdot3+60]:(3^2-6)=\\\; [9-(9-7)\cdot3+60]:(9-6)=\\\;[-2\cdot3+69]:3=\\\;[-6+69]:3=\\\;63:3=21$