\(\times+\left(\times+1\right)+\cdot\cdot\cdot+\left(\times+10\right)=660\)
\(\Rightarrow11\times+\left(1+2+\cdot\cdot\cdot+10\right)=660\)
\(\Rightarrow11\times+55=660\)
\(\Rightarrow11\times=660-55\)
\(\Rightarrow11\times=605\)
\(\Rightarrow\times=55\)
1/11x16+ 1/16x21+ 1/21x26+...+X x ( x+5 ) = 1/660
Tìm x
a) 46 874 – x = 1465
b) x - 1489 = 74 660
tim X
a) X-1/8= 2va1/3 nhan 5 va 1/4
b) X:3/2 =1/4
c) 10 va 3/10- x= 4/5
d)x:4/17 = 51
lam nhanh nhanh giup minh
2×x+2x÷2=10 tim x
tong cua 3 so le lien tiep la 21 . tim 3 so do
tim x
X x2 + X / 2 = 10
tim x là số tròn chục biết: X x 2 - 10 < 50
Tim x:
X+8+5:2=10
Xx2+X/2=10 tim X
tim x: x*2 + \(\frac{x}{2}\)=10
