Question

aplicar la distributiva doble resolver:

(7+4).(5-3) =


(3+12).(21+3)=


(2x+1).(3+2)=

Answer 1

$(7 + 4) \times (5 - 3) = 7(5 - 3) + 4(5 - 3) \\ 7 \times 5 - 7 \times 3 + 4 \times 5 - 4 \times 3 = 22$

$(3 + 12) \times (21 + 3) = 3(21 + 3) + 12(21 + 3) \\ 3 \times 21 + 3 \times 3 + 12 \times 21 + 12 \times 3 = 360$

$(2x + 1) \times (3 + 2) = 2x(3 + 2) + 1(3 + 2) \\ 2x \times 3 + 2x \times 2 + 1 \times 3 + 1 \times 2 \\ 6x + 4x + 3 + 2 \\ 10x + 6$