P = \(\frac{1}{1.2}\)+\(\frac{2}{2.4}\)+\(\frac{3}{4.7}\)+ .... +\(\frac{10}{46.56}\)
\(D=\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+...+\frac{10}{46.56}\)
D= 1/1 - 1 /2 + 1/2 - 1/4 + 1/4 - 1/7 +...+ 1/46 - 1/56
D= 1/1 - 1/56
D= 55/56
vậy D= 55/56
Tính \(\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+...+\frac{10}{46.56}\)
\(P=\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+...+\frac{10}{46.56}\)
giúp mih vs nhoa
P=\(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{46}-\frac{1}{56}\)
P=\(1-\frac{1}{56}\)
P=\(\frac{55}{56}\)
P = 1 - 1/2 + 1/2 - 1/4 +.......+1/46 - 1/56
P = 1 - 1/56
P = 55/56 nha!
dễ thôi
P= 1/1.2 + 2/2.4 + 3/4.7 + ... + 10/46.56
P= 1- 1/2 + 1/2 - 1/4 + 1/4 -1/7 +... + 1/46 - 1/56
P=1 - 1/56
P=55/56
tính
\(P=\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+...+\frac{10}{46.56}\)
giups mih vs
\(P=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{46}-\frac{1}{56}\)
\(P=1-\frac{1}{56}\)
\(P=\frac{55}{56}\)
P = \(\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+...+\frac{10}{46.56}\)
(nhớ có cả lời giải nhé )
P= 1/1 -1/2 + 1/2 -1/4 + 1/4 - 1/7 +....+ 1/46 -1/56
P= 1/1 - 1/56
=> P= 55/ 56
Có \(\frac{1}{1.2}=\frac{1}{1}-\frac{1}{2}\)
\(\frac{2}{2.4}=\frac{1}{2}-\frac{1}{4}\)......................... tương tự đến \(\frac{10}{46.56}=\frac{1}{46}-\frac{1}{56}\)
suy ra P= 1-\(\frac{1}{56}\)=\(\frac{55}{56}\)
P = \(\frac{1}{1.2}\)+ \(\frac{2}{2.4}\)+ \(\frac{3}{4.7}\)+ .....+ \(\frac{10}{46.56}\)
LÀM GIÚP MIK VS,,,CẢM ƠN
=1/1-1/2+1/2-1/4+...+1/46-1/56
=1-1/56
55/56
\(P=\frac{1}{1\cdot2}+\frac{2}{2\cdot4}+\frac{3}{4\cdot7}+...+\frac{10}{46\cdot56}\)
\(\Rightarrow P=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{46}-\frac{1}{56}\)
\(\Rightarrow P=1-\frac{1}{56}\)
\(\Rightarrow P=\frac{55}{56}\)
1/1.2 + 2/2.4 + 3/4.7 +...+ 10/46.56 = ?
1:1.2+2:2.4+3:4.7+.......+10:46.56
1/1.2+2/2.4+3/4.7+...+10/46/56
=1-1/2+1/2-1/4+1/4-1/7+...+1/46-1/56
=1-1/56
=55/56
1/1.2+2/2.4+3/4.7+............+10/46.56
1/1.2+2/2.4+3/4.7+...+10/46.56
=1-1/2+1/2-1/4+1/4-1/7+...+1/46-1/56
=1-1/56
=55/56