Question

bài 1 tinh nhanh

12+14+16+18+2+4+6+8

200.2+200.2

Answer 1

Bằng 480, 4 chứ các bạn làm sai rồi 

Answer 2

12+14+16+18+2+4+6+8

=12+8+14+6+18+2+16+5

=20+20+20+20

=80

200x2+200x2

=400+400=800

Answer 3

12+14+16+18+2+4+6+8

=(12+8)+(14+6)+(16+4)+(18+2)

=20+20+20+20

=80

200x2+200x2

=(200+200)X2

=800

=2