Tính A = (1+1/2.4).(1+1/2.4).(1+1/3.5).....(1+1/49.51)
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Tính tích:
S=(1+1/2.4)(1+1/3.5)(1+1/4.6).....(1+1/49.51)
rút gọn biểu thức P=(1+1/1.3).(1+1/2.4).(1+1/3.5)...(1+1/49.51)+2/51
Rút gọn biểu thức P=(1+1/1.3).(1+1/2.4).(1+1/3.5)...(1-1/49.51)+2/51
1+1/1.3= 2^2/1.3
1+1/2.4=9/2.4=3^2/2.4
1+1/3.5=16/3.5=4^2/3.5
...................................
1+1/49.51=2500/49.51=50^2/49.50
2^2.3^2. ... . 50^2/ 1.3.2.4.3.5.4.6. .... 49.51 +2/51
2.50/51 +2/51 =2
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S=(1+1/2.4)+(1+1/3.5)+(1+1/4.6)+...+(1+1/49.51)
Giúp mình với, đang rất gấp
rút gọn biểu thức :
P=(1+ 1/1.3)(1+ 1/2.4)(1+ 1/3.5)......(1+1/49.51)+2/51
Rút gọn biểu thức :
(1+ 1/1.3) ( 1+1/2.4) ( 1+1/3.5)...(1+1/49.51)+2/51
Tính: P=\(\left(1+\frac{1}{1.3}\right)\left(1+\frac{1}{2.4}\right)\left(1+\frac{1}{3.5}\right)...\left(1+\frac{1}{49.51}\right)+\frac{2}{51}\)
A= 1/1.2+1/2.3+1/3.4+...+1/49.50
A=2/1.3+2/3.5+2/5.7+....+2/49.51
A=1/2.4+1/4.6+1/6.8+....+1/18+20
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\(A=\) \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{49}-\frac{1}{50}\)
\(A=1-\frac{1}{50}\)
\(A=\frac{49}{50}\)
\(A=\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+...+\frac{2}{49.50}\)
A= \(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{49}-\frac{1}{51}\)
A = \(\frac{1}{1}-\frac{1}{51}=\frac{50}{51}\)
\(P=\left(1\div\frac{1}{1.3}\right)\left(1\div\frac{1}{2.4}\right)\left(1\div\frac{1}{3.5}\right)...\left(1\div\frac{1}{49.51}\right)+\frac{2}{51}\)