80 - [ 130 - ( 12 - 4)^2 ]

= 80 - [ 130 - 8^2 ]

= 80 - [ 130 - 64 ]

= 80 - 66

= 14

80 - [ 130 - ( 12 - 4 ) ² ]

= 80 - [ 130 - 64 )

= 80 - 66

= 14

80-[130-(12-4)² ]

=80-[130-8² ]

=80-[130-64]

=80-66

=14

nha bạn

** mk nha

a) \(17+188+183=205+183=388\)

b) \(80-\left[130-\left(12-4\right)^2\right]\)

\(=80-\left(130-64\right)\)

\(80-66=14\)

c) \(2^3.17-2^3.14\)

\(8.17-8.14\)

\(=8.\left(17-14\right)\)

\(=8.3=24\)

   80 - [ 130 - ( 12-4 )2]

= 80 - [ 130 - 8 mũ 2 ]

= 80 - [ 130 - 64 ]

= 80 - 66

= 14

80 - [130 - (12 - 4)^2] = 80 - (130 - 8^2) = 80 - (130 - 64) = 80 - 66 = 14
chúc bạn học tốt

Cảm ơn nhé ^ *

80 – [130 – (12 - 4)2] = 80 – [130 – 82]

= 80 – [130 - 64] = 80 - 66 = 14

\(a,=2^3\left(17-14\right)=2^3\cdot3=24\\ b,=80-\left(130-8^2\right)=80-\left(130-64\right)=80-66=14\)

\(\text{80-[130-(12-4)^2]}=14\)

\(80-\left[130-\left(12-4\right)^2\right]=80-\left[130-8^2\right]=80-\left[130-64\right]=80-66=14\)

\(80-\left[130-\left(12-4\right)^2\right]\)

\(=80-\left[130-8^2\right]\)

\(=80-\left[130-64\right]\)

\(=80-66\)

\(=14\)

A=\(\frac{3}{4}+\frac{3}{28}+\frac{3}{70}+\frac{3}{130}+\frac{3}{208}+\frac{3}{304}\)

A= \(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}+\frac{3}{13.16}+\frac{3}{16.19}\)

A= \(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}+\frac{1}{17}-\frac{1}{19}\)

A= 1 - \(\frac{1}{19}\)

A= \(\frac{18}{19}\)

X=3/4+3/28+...+3/304

X=3/1x4+3/4x7+....+3/13x16

X=1-1/4+1/4-1/7+....+1/13-1/16

X=1-1/16

X=15/16

k cho tớ nha Nguyễn Thu Trang 

A=3/4+3/28+3/70+3/130+3/208+3/304

  =3/1x4+3/4x7+3/7x10+3/10x13+7/13x16+7/16x19

  =3/1-3/4+3/4-3/7+3/7-3/10+3/10-3/13+3/13-3/16+3/16-3/19

  =3/1-3/19=57/19-3/19=54/19

a)5.4²-18:3²=5.16-18:9=80-2=78

b)3³.18-3².12=3²(18-12)=3².6=54

c)39.213+87.39=39(213+87)=39.300=11700

d)80-[130-(12-4²)=80-(130+4)=80-134=-54

Làm ơn giúp li đi mà T.T

câu d chịu