Question

Matematica
12. Calculati, folosind factori comun.
4) -237-38-237-12;
b) -143-143-2-143-3-...-143-11.
c)-5-10-15-...-45,
d)-12-12-34 +12-35:
e) -312-29-312-181 +312-116-
-2021-2020+2020-2019+2-2018,
3) -2020-2021-2020+2022-2018: Dau 50 puncte pentru un răspuns corect ⭐️⭐️⭐️⭐️⭐️
h)-11-22-33-...-99.

Answer 1

Răspuns:

-237-38-237-12=-237(-38-12)=-237×-40=9480

-143-143-2-143-3...-143-11=-143(1-2-3-....-11)

-5-10-15.....-45=-5(1+2+3......+9)

-12-12-34+12-35=-12(1-34+35)=-12×2=-24