y : 1/8 +y : 1/2 = 140 + 1/4
y x 8 + y x 2 = 140 + 1/4
y x ( 8 + 2) = 140 + 1/4
y x 10 = 140 + 1/4
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tim y biet: (y+1/2)+(y+1/4)+(y+1/8)+...+(y+1/1024)=1
Tim y biet : ( 1/2*4 + 1/4*6 + 1/6*8+ 1/8*10 ) * y = 1/3
tim y biet :7/4-y*5/6=1/2+1/3
Tim y biet:7/4-yx5/6=1/2=1/3
2. Tim x tren y biet
a. x/y + 4/5 = 8/6
b. x/y - 4/5 = 2/3
c. 5/8 * x/y = 5/12
d. x/y : 2/9 = 3/8
tim y biet
( y+1)+(y+4)+(y+7)+(y+10)+...+(y+28)=155
3nguoi nhanh nhat mik se tick nhe!
tim y biet (y+1)+(y+2)+(y+3)+ . . . +(y+9)+(y+10) =2012
tim x,y biet
/ x+2/ +/y-1/=0
tim tong tat ca cac so tu nhien y biet 4/5>y/15>1/6