tim x : (x+1)+(x+4)+(x+7)+(x+10)+(x+13)+...................+(x+28)=155
Tim x , biet :
( x + 1 ) + (x + 4 ) + (x + 7 ) + ... + (x + 28 ) = 155
ghi cach giai giup minh nha . lam dung , minh tick cho
(x+1)+(x+4)+(x+4)+(x+7)+(x+10)+........+(x+28)=155
(X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
(X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
Tìm X : (X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
Tìm X: (X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
(x+1)+(x+4)+(x+7)+...+(x+28)=155
( x + 1) +( x + 4 ) + ( x + 7 ) + ...+( x + 28 ) = 155