Question

ubica los parentesis donde sea presiso para obtener cada resultado

15÷5+3*5+9÷3=21
15÷3+2÷(-2)+4*3-2=14
18÷(3*2)+6*(-5)+3=-9

Answer 1

$(15 \div 5) + (3 \times 5) + (9 \div 3) = 21 \\ (15 \div 3) + (2 \div ( - 2)) + (4 \times 3) - 2 = 14 \\ 18 \div (3 \times 2) + (6 \times ( - 5) )+ 3 = - 9$