Question

x+(x+1)+(x+2)+(x+3)+..........+(x+30=1240

giup nha

Answer 1

b) x+ (x+1)+(x+2)+...+(x+30)=1240

(x+0) + (x+1)+(x+2)+...+(x+30)=1240

X x 31 + (1+2+3+..+30) = 1240

X x 31 + 465 = 1240

X x 31 = 1240 – 465 = 775

X = 775 : 31

X = 25

Answer 2

x=25 nha bạn

Answer 3

x+(x+1)+(x+2)+(x+3)+..........+(x+30=1240

=31xX+1+(1+30)x15=1240

=31xX+1+31x15=1240

=31xX+466=1240

=31xX=774

x=\(\frac{774}{30}\)

Answer 4

(x+x+x+...+x)+(1+2+3+...+30)=1240

31x+465=1240

31x=1240-465

31x=775

x=775:31

x=25

Answer 5

x+(x+1)+(x+2)+(x+3)+...+(x+30)=1240

x+x+1+x+2+x+3+...+x+30=1240

(x+x+x+...+x)+(1+2+3+...+30)=1240

31x+465=1240

31x=775

x=25

Vậy x = 25

k nha

Answer 6

x+(x+1)+(x+2)+(x+3)+...+(x+30)=1240

(x+x+x+x+...+x)+(1+2+3+...+30)=1240

(31*x)+465=1240

31*x=1240-465

31*x=775

x=775:31

x=25

Answer 7

Các bạn sai hết rồi lấy x ra còn lại 1 nữa mà 1+2+.........+30 phải công thêm 1 nữa