1,0008969x10^16

k nha

12 x 23 x 34 x 45 x 56 x 67 x 78 x 89 x 910 = 10008969

25 + 45 + 56 + 89 + 5 + 2 + 45 = 267

25 + 45 + 56 + 89 + 5 + 2 + 45

= 267

 Số 0 sai rồi 12^x không bao giờ có số tận cùng là 0 đâu

10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000+2000000000000000000000000000000000999999999999999999999999999999999999999999999999999999999999999999999999999999999999444444444444444444444444444444444444444477777777777777777777777777777777777777777777777777772222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222299999999999999999999999999999922222222222222222222222222222222222222222999999999999922222222222222999999999999222222222222999999999999222222222229999999999992222222222=?

bài này dễ lắm chị ơi

dạy cho cj với

x(x+y)=-45

x^2+xy=-45

y(x+y)=5

xy+y^2=5

=>x^2+xy+xy+y^2=-45+5

x^2+2xy+y^2=-40

(x+y)²=-40 mà số mũ chẵn luôn được 1 số nguyên dương nên x,yE\(\phi\)

Vậy số cặp (x;y) thỏa mãn đề là 0

mk k biết đúng k nữa, dù sao cũng học lp 7