so sánh \(A=\frac{201+200}{201-200},B=\frac{\left(201^2+200^2\right)}{201^2-200^2}\)
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Ta có:\(\frac{200}{201}>\frac{200}{201+202}và\frac{201}{202}>\frac{201}{201+202}\)
Suy ra\(\frac{200}{201}+\frac{201}{202}>\frac{200}{201+202}+\frac{201}{201+202}=\frac{200+201}{201+202}\)
Vậy\(\frac{200}{201}+\frac{201}{202}>\frac{200+201}{201+202}\)
\(\frac{199}{200}>\frac{199}{200+201+202}\)
\(\frac{200}{201}>\frac{200}{200+201+202}\)
\(\frac{201}{202}>\frac{201}{200+201+202}\)
=>\(A>B\)
Do \(\frac{199}{200}\)> \(\frac{199}{200+201+202}\), \(\frac{200}{201}\)>\(\frac{200}{200+201+202}\),\(\frac{201}{202}\)>\(\frac{201}{200+201+202}\)nên A>B
\(A=\frac{199}{200}+\frac{200}{201}+\frac{201}{202}< \frac{199}{200+201+202}+\frac{200}{200+201+202}+\frac{201}{200+201+202}\)
A \(< \frac{199+200+201}{200+201+202}=B\)
\(A< B\)
Ta có: \(A=\frac{199}{200}+\frac{200}{201}+\frac{201}{202}< \frac{199}{200+201+202}+\frac{200}{200+201+202}+\frac{201}{200+201+202}< \)
\(< \frac{199+200+201}{200+201+202}\)
Vậy A < B
ỦNG HỘ TỚ NHA
a/\(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
=\(\frac{2^3.5^3.7^4}{2^2.5^2.7^4}\)
=2.5
=10
\(\frac{200+201}{201+202}=\frac{200}{201+202}+\frac{201}{201+201}\)
Mà \(201\frac{200}{201+202}\)
\(\frac{201}{202}>\frac{201}{201+202}\)
=> \(\frac{200}{201}+\frac{201}{202}>\frac{200+201}{201+202}\)
b)2014/2014*2015=2014:2014/2014*2015:2014=1/2015(rút gọn phân số)
2015/2015*2015=2015:2015/2015*2016:2015=1/2016(rút gọn phân số)
Mà 1/2015>1/2016
=>2014/2014*2015>2015/2015*2015