Question

Substitua o sinal (?) pelos sinais (+,-,×,÷)

(2 ? 3 ) ? 5 =0
( 9 ? 6 ) ? 7 = 21
2 ? (5 ? 9) = 90
(25 ? 5) ? 3 = 10

Answer 1

(2+3)-5=0

(9-6)×7=21

2×(5×9)=90

(25+5)÷3=10