find x
x + y * 1 * 0 = 9
x+20+30+10+40+50=170
x+10+20+30+40+50=?
10 + 30 + 70 : 90=?
2 + 3 + 4 + 5 + 100 + 6=?
10 + 20 : 5 + 6 + 90 + 100=?
http://lazi.vn/users/dang_ky?u=nguyen.long1
đăng kí nha
x + 10 = 20 + 30
20 + 20 + 20 + 20 + 20 + 30 + 30 +30 + 30 + 30=?
450 +20 + 50 + 80 + 100=?Dễ
\(\dfrac{1}{2}\) + \(\dfrac{1}{6}\) + ...+ \(\dfrac{1}{30}\) + \(\dfrac{1}{42}\)=?