a. 9999.997 + 9999 + 9999 + 9999

= 9999.(997 + 1 + 1 + 1)

= 9999 . 1000

= 9999000

b. (456 . 11 + 912) . 37 : 13 : 74

= (5016 + 912) . 37 : 13 : 74

= 219336 : 13 : 74

= 16872 : 74

= 228

c. 864 . 48 - 432 . 96 : 864 . 48 . 432

=  (864 . 48 - 432 . 96) : (864 . 48 . 432)

= 0 : (864 . 48 . 432)

= 0

a. 9999.997 + 9999 + 9999 + 9999

= 9999.(997 + 1 + 1 + 1)

= 9999 . 1000

= 9999000

b. (456 . 11 + 912) . 37 : 13 : 74

= (5016 + 912) . 37 : 13 : 74

= 219336 : 13 : 74

= 16872 : 74

= 228

c. 864 . 48 - 432 . 96 : 864 . 48 . 432

=  (864 . 48 - 432 . 96) : (864 . 48 . 432)

= 0 : (864 . 48 . 432)

= 0

jjjhhhhhhhhhhhhhh

cauu hỏi giống mik

A= 1111......1*3*111111111...1*9

A= 111111...1 *3*9

A=111....1*27

A=272727..27

A có 51 chữ số

đây là toán bồi đúng ko

a: \(=1089^4-1089^4+1=1\)

b: \(=\left(9999+1\right)^3-3\cdot9999\left(9999+1\right)+3\left(9999^2+9999\right)\)

=10000^3=10^15

=9999 nha 

trả lời : 

3 + 9999 - 3 = 9999

@.@

\(9999\)

 Làm quen và kb nha

\(M=1+\frac{1}{5}+\frac{3}{35}+...+\frac{3}{9603}+\frac{3}{9999}\)

\(=\frac{3}{1\times3}+\frac{3}{3\times5}+\frac{3}{5\times7}+...+\frac{3}{97\times99}+\frac{3}{99\times101}\)

\(=\frac{3}{2}\times\left(\frac{2}{1\times3}+\frac{2}{3\times5}+\frac{2}{5\times7}+...+\frac{2}{97\times99}+\frac{2}{99\times101}\right)\)

\(=\frac{3}{2}\times\left(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{97}-\frac{1}{99}+\frac{1}{99}-\frac{1}{101}\right)\)

\(=\frac{3}{2}\times\left(1-\frac{1}{101}\right)=\frac{150}{101}\)