Toán Lớp 6: thực hiện phép tính a.53+46+47 b.25.8.43.4.2=200.43.8 C.13.75+13.25 D.[58-[27+(12-8)^2]}:3 e.3^2.10^3-[13^2-(5^2.4+2^2.15)].10^3

Question

Toán Lớp 6:  thực hiện phép tính a.53+46+47 b.25.8.43.4.2=200.43.8 C.13.75+13.25 D.[58-[27+(12-8)^2]}:3 e.3^2.10^3-[13^2-(5^2.4+2^2.15)].10^3

behocgioitoan · Answer

a.  53+46+47   = (53+47)+46   = 100+46   =146    b.   25.8.43.4.2=200.43.8     = (25.4).2.43.8 = 200.43.8     = 100.2.43.8 = 200.43.8     = 200.2.43.8 = 200.43.8     = 68800 = 68800      c.  13.75+13.25    = 13. (75+25)   = 13. 100   = 1300    d.  { 58-[27+(12-8)^2]}:3     = {58-[27+20^2]}:3     = {58-[27+400]}:3     = {58- 427}:3     = -369:3     = -123      e.  3^2.10^3-[13^2-(5^2.4+2^2.15)].10^3     = 3^2.10^3 - [ 13^2-(25.4+4.15)].10^3     = 3^2.10^3 -[ 13^2-160]. 10^3     = 3^2.10^3 -[ 169-160]. 10^3     = 3^2.10^3 - 9. 10^3     = 3^2.10^3 - 3^2.10^3     = 0       T&iacute;ch 5 sao v&agrave; ctlhn cho m&igrave;nh nh&eacute;!