(y+y+...+y)+(1+3+5+....+99)=5049
(99 x y)+\(\frac{\left(99+1\right)x99}{2}\)=5049
(99 x y)+4950=5049
99 x y=5049-4950
99 x y=99
y=1
k mk nha mk đag âm điểm
Tìm y nếu: y+1+y+3+y+5+.....+y+99=5050
Giúp mình nha, ai nhanh cho một điểm hi hi
y+1+y+2+y+3+y+4+y+5+y+6+y+7+y+8+y+9+y+10=?
5*y=35
y*1=30
y*5=0
y:3=4
y:1=30
4*y=0
1)Tìm y
a) y*3+y*5+y-289=7829
b)4*8+19-y=28
Tìm y
1 ) y x 5 + y x 6 + y x 2 - y x 3 = 20
Tìm y
1 ) y x 12- y x 8 + y = 15
2 ) 49 - 7 x y = 0
3 ) y x 5 + y x 6
bài 1 : Tìm y
\(\dfrac{7}{8}xy-\dfrac{6}{4}=\dfrac{3}{2}\) \(\dfrac{2}{5}:y+\dfrac{1}{5}:y=\dfrac{10}{3}\)
bài 2 : Tính nhanh
\(\dfrac{2}{5}x\dfrac{4}{7}+\dfrac{2}{5}x\dfrac{3}{7}\) \(\dfrac{2}{9}:\dfrac{2}{3}:\dfrac{3}{9}\)
tim y
y*6+1+3+5+7+...+19
y=?
tính: 7/4 - y* 5/6 = 1/2 + 1/3 y = ?