a) (-7) . 8 = -56

b) 6 .(-4) = -24

c) (-12) . 2 = -24

d) 450 . (-2) =-900

Nhớ ủng hộ 1 Đúng !

a) (-7).8 = -56

b) 6.(-4) = -24

c) (-12).12 = -144

d) 450.(-2) = -900

100:{250:[450-(4.5³-2².25)}]

=100:{250:[450-(500-100)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

  100:{250:[450-(4.5^3-2^2.25)]}

=100:{250:[450-(4.125-4.25)]}

=100:{250:[450-(500-100)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

                             ~Chúc học tốt!~

\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\)

= \(100:\left\{250:\left[450-\left(2^2.5^3-2^2.5^2\right)\right]\right\}\)

= \(100:\left\{250:\left[450-2^2.5^2\left(5-1\right)\right]\right\}\)

= \(100:\left[250:\left(450-100.4\right)\right]\)

=\(100:\left(250:50\right)\)

= \(100:5\)

= \(20\)

a: \(25\cdot2^3-\left\lbrack164-\left(12-4\right)^2\right\rbrack+10\cdot2018\)

\(=25\cdot8-\left\lbrack164-8^2\right\rbrack+10\cdot2018\)

=200-(164-64)+20180

=20380-100

=20280

b: \(100:\left\lbrace250:\left\lbrack450-\left(4\cdot5^3-2^2\cdot25\right)\right\rbrack\right\rbrace\)

=100:{250:[450-(4*125-4*25)]}

=100:{250:[450-(500-100)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

a,  600 : { 450 : 450 - 4 . 5 3 - 2 3 . 5 2 }

= 600:{450:[450 - (4.125 - 8.25)]} = 600:{450:[450 - (500 - 200)]}

= 600:{450:[450 - 300]} = 600:{450:150} = 600:3 = 200

b,  18 . { 420 : 6 - 150 - ( 68 . 2 - 2 3 . 5 ) }

= 18.{70 - [150 - (68.2 - 8.5)]} = 18.{70 - [150 - (136 - 40)]}

= 18.{70 - [150 - 96]} = 18.{70 - 54} = 18.16 = 288

\(\frac{\left(2^{100}+2^{101}+2^{102}\right)}{\left(2^{97}+2^{98}+2^{99}\right)}=\frac{2^{100}(1+2+2^2)}{2^{97}(1+2+2^2)}=\frac{2^{100}(1+2+4)}{2^{97}(1+2+4)}=\frac{2^{100}\cdot7}{2^{97}\cdot7}=\frac{2^{100}}{2^{97}}=2^{100-97}=2^3=8\)

Ta có: \(\frac{2^{100}+2^{101}+2^{102}}{2^{97}+2^{98}+2^{99}}\)

\(=\frac{2^{100}\left(1+2+2^2\right)}{2^{97}\left(1+2+2^2\right)}=2^3=8\)

2³.2⁴.2⁶ = 2³⁺⁴⁺⁶= 2¹³

2³ . 2⁴ . 2⁶ = 2³⁺⁴⁺⁶ = 2¹³