A=1+1/3+1/6+1/10+....+1/x*(x+1):2=3868/1935
tìm x biết x+1250=99978-6540
x*10 +x*100+x*300 +X*512=1250-x*400-x*500
tìm x :
(x+1250)+x=1+2+3+4+........+2000
72,88 x 250 =?
93,25 x 200 =?
69,4 x 1250 =?
69,4 x 125 =?
49,36 x 0,02 =?
CÂU 1:
a) 155964 + 456821 =
b) 193574862 +1935 =
CÂU 2:
a) 99 x 5 + 3 x 4 =
b) 8 + 9 + 6 x 3 =
\(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+.........+\frac{1}{x\cdot\left(x+1\right):2}=1\frac{1933}{1935}\)
tinh nhanh
0,18 x 1250 + 9 x 45 x 2 + 3 x 425 x 0,6
giai ho mik voi dang can gap