a) 63 × 100 : 10 = 6300 : 10 = 630

b)960 × 1000 : 100 = 960000 : 100 = 9600

c)79 × 100 : 10 = 7900 : 10 = 790

d)90000 : 1000 × 10 = 90 × 10 = 900

\(910+920+930+940+950+960+970+980+990+1000\)

\(=\left(910+990\right)+\left(920+980\right)+\left(930+970\right)+\left(940+960\right)+\left(950+1000\right)\)

\(=1900+1900+1900+1900+1950\)

\(=7600+1950\)

\(=9550\)

`#3107.101107`

\(910 + 920 + 930 + 940 + 950 + 960 + 970 + 980 +990 + 1000\)

`= (910 + 1000) + (920 + 990) + (930 + 980) + (940 + 970) + (950 + 960)`

`= 1910 + 1910 + 1910 + 1910 + 1910`

`= 1910 \times 5`

`= 9550`

1000 +1000 +1000 +1000 + x = 5000

  4000 + x = 5000

x = 5000 - 4000

x = 1000

1000+1000+1000+1000+x=5000

1000*4+x=5000

4000+x=5000

x=5000-4000

x=1000

a=\(\frac{1}{9}\)

c=\(\frac{3069}{500}\)

= 98/45-31/15

=1/9

=100000 bn nhé

=100000

k mk nha pạn

A bạn nhé

HT

Đáp án A

(1000 - 1³) x (1000 - 2³) x (1000 - 3³) x ... x (1000 - 10³) x ... x (1000 - 50³)

= (1000 - 1³) x (1000 - 2³) x (1000 - 3³) x ... x (1000 - 1000) x ... x (1000 - 50³)

= (1000 - 1³) x (1000 - 2³) x (1000 - 3³) x ... x 0 x ... x (1000 - 50³)

= 0

1000+1000+1000+x=4000

3000+x=4000

x=4000-3000

x=1000

mình mình tk lại

X= 1000