-(27 - 85) - (73 + 15)

= -27 + 85 - 73 - 15

= (-27 - 73) + (85 - 15)

= -100 + 70

= -30

a)73.(74-72)+72.(73-74)

=74.(73-73)+(72-72)

=74.0+0

=74

b)37.(25+27)-27.(37+25)

=37.52-27.62

=1924-1674

=250

tick cho mk nha bạn

a)

\(15+27+9+85+73\)

\(=\left(15+85\right)+\left(27+73\right)+39\)

\(=200+39\)

\(=329\)

b)

\(54.36+54.27+54.37\)

\(=54\left(36+27+37\right)\)

\(=54.100\)

\(=5400\)

c)

\(168-3^7:3^4+2013^0\)

\(=168-3^3+1\)

\(=168-27+1\)

\(=142\)

d)

\(3^4.15+81.26+27.59.3\)

\(=81.15+81.26+81.59\)

\(=81.\left(15+26+59\right)\)

\(=81.100\)

\(=8100\)

Tính giá trị của các biểu thức sau :

a.15 + 27 + 39 + 85 + 73

= ( 15 + 85 ) + ( 27 + 73 ) + 39

= 100 + 100 + 39

= 200 + 39

= 239

b. 54 .36 + 54 . 27 + 54 . 37

= 54 . ( 36 + 27 + 37 )

= 54 . 100

= 5400

c.168 - 3⁷ : 3⁴ + 2013⁰

= 168 - 3³ + 1

= 168 - 27 + 1

= 141 + 1

= 142

đ. 3⁴ . 15 + 81 . 26 + 27 . 59 . 3

= 3⁴ . 15 + 3⁴ . 26 + 3⁴ . 59

= 3⁴ . ( 15 + 26 + 59 )

= 81 . 100

= 8100

a: \(2^3-5^3:5^2+12\cdot2^2\)

\(=8-5+48\)

\(=51\)

b: \(5\cdot\left[\left(85-35:7\right):8+90\right]-5\)

\(=5\cdot\left[10+90\right]-5\)

=495

73 . 35 + 27 . 19 - 20 . 73 + 81 . 27 + 85 . 73

= 73 . ( 35 - 20 + 85 ) + 27. ( 19 + 81 )

= 73 . 100 + 27. 100

= ( 73 + 27 ) . 100

= 100 . 100

= 10 000

73. 35+ 27.19- 20. 73+ 81. 27+ 85. 73

= 73.(35+ 85 - 20) + 27.(19+81)

=73.100 +27.100

=100.(27+73)

=100.100

=10000

Tick mìn nha