\(y-\frac{1}{2}-\frac{1}{6}-\frac{1}{12}-\frac{1}{20}-\frac{1}{30}-\frac{1}{42}=1\)
\(y-\frac{210}{420}-\frac{70}{420}-\frac{35}{420}-\frac{21}{420}-\frac{14}{430}-\frac{10}{420}=1\)
\(y-\frac{210-70-35-21-14-10}{420}=1\)
\(y-\frac{60}{420}=1\)
\(y-\frac{1}{7}=1\)
\(y=1+\frac{1}{7}\)
\(y=\frac{7}{7}+\frac{1}{7}\)
\(y=\frac{8}{7}\)
y-1/2-1/6-1/12-1/20-1/30-1/42=1.Tìm y
tìm y biết:
y + 2 × y + 3 × y + 4 × y + ... + 10 × y = 49,5
Tính nhanh :
1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56
y - 1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 = 1
Mọi người giúp mình bài này với ạ
tìm x
x + 1/2 +1/6 + 1/12 +1/20 + 1/30 + 1/42 = 1
Tìm x, tính hợp lý nếu có thể: cho x - (1/2 + 1/6 +1/12 +1/20 +1/30 +1/42) =1
Tìm y (1/2+1/4+1/8+1/16):y=1/2+1/6+1/12+1/20+1/30+...+1/132
Tìm A biết : A = 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42
1/2+1/6+1/12+1/20+1/30+1/42
M=1/2+1/6+1/12+1/20+1/30+1/42
