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question: 20+30+40+50+60=?
20+30+40+50+60+70+80=?
20+30+40+50+60+70=?
10+20+30+40+50+60+70+80+90=?
\(\dfrac{a}{6}\) = \(\dfrac{b}{3}\) = \(\dfrac{c}{12}\) and a - b + c =30
\(\dfrac{a}{3}\) = \(\dfrac{b}{4}\) and a + b = 14
x . 5 + 20 . x + 40 : 2 = 70
x = ?
x . 10 + 20 . x + 40 : 2 = 80
x =?
\(\dfrac{x}{5}\) = \(\dfrac{y}{2}\) = \(\dfrac{z}{3}\) and 2x - 3y + 5z = 38
\(\dfrac{x}{3}\)=\(\dfrac{y}{5}\) and y - x = 20
\(\dfrac{x}{3}\)=\(\dfrac{y}{4}\) and x + y = 14
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9=?
10 + 20 + 30 + 40 + 50 + 60 +70 + 80 + 90=?
3 x 10 + 3 x 20 = ?
10 + 10 + 10 + 20 + 20 + 20 + 30 + 30 + 30=?
a x (b + c)=>
a x (b - c)=>
123 + 123 + 123 + 123=?
234 + 234 + 234 + 234=?
456789 là số có mấy số?
