Question

tim ket qua cua phep nhan : 333...3 * 999...9  10 chu so 3 va 10 chu so 9

Answer 1

333...3 x 999...9

(10 c/s 3)(10 c/s 9)

= 333...3 x (1000...0 - 1)

(10 c/s 3)    (10 c/s 0)

= 333...3 x 1000...0 - 333...3

(10 c/s 3)   (10 c/s 0)(10 c/s 3)

= 333...3000...0 - 333...3

(10 c/s 3)(10 c/s 0)(10 c/s 3)

= 333...32666...67

(9 c/s 3)   (9 c/s 6)

Answer 2

Có đúng không hả bạn ?

Answer 3

333...3 x 999...9

(10 c/s 3)(10 c/s 9)

= 333...3 x (1000...0 - 1)

(10 c/s 3)    (10 c/s 0)

= 333...3 x 1000...0 - 333...3

(10 c/s 3)   (10 c/s 0)(10 c/s 3)

= 333...3000...0 - 333...3

(10 c/s 3)(10 c/s 0)(10 c/s 3)

= 333...32666...67

(9 c/s 3)   (9 c/s 6)