Question

Tính nhanh nếu có thể 

a)  3 . 5 mũ 2 - 64 : 2 mũ 3

b)  53 . 18 + 2 . 9 . 78 - 18 . 40

c)  78 : { 390 : [ 410 - ( 340 + 15 . 4 ) ] } +2019 mũ 0

 

Answer 1

a)3.5²-64:2³

=3.25-64:8

=75-8

=67

b)53.18+2.9.78-18.40

=18.(53+2.9.78-40)

=18..(53+1404-40)

=18.1417

=25506

c)78:{390:[410-(340+15.4)]}+2019⁰

=78:{390:[410-(340+60)]}+1

=78:{390:[410-400]}+1

=78:{390:10}+1

=78:39+1

=2+1

=3

  Cho mk 1 tk nha

Answer 2

b, 53.18+2.9.78-18.40

=53.18+18.78-18.40

=18.(53+78-40)

=18.91

=1638