6 800-1648:8+78*4=? 31 100-(4 180*3+236*8)=? (2600-2 320):4+140*3=? помогите!

Question

6 800-1648:8+78*4=? 31 100-(4 180*3+236*8)=? (2600-2 320):4+140*3=? помогите!

Answer 1

6800-1648÷8+78×4=6800-206+312=6800+106=6906
31100-(4180×3+236×8)= 31100-(12540+1888)=31100-14428=16672
2600-2320)÷4+140×3=280÷4+140×3=70+420=490