202:x+203:x=9
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Xét B = \(\frac{201+202+203}{202+203+204}\)
= \(\frac{201}{202+203+204}\)\(+\)\(\frac{202}{202+203+204}\)\(+\)\(\frac{203}{202+203+204}\)
Vì 202 < 202 + 203 + 204
=> \(\frac{201}{202}\)> \(\frac{201}{202+203+204}\)( 1 )
Vì 203 < 202 + 203 + 204
=> \(\frac{202}{203}\)>\(\frac{202}{202+203+204}\)( 2 )
Vì 204 < 202 + 203 + 204
=> \(\frac{203}{204}\)> \(\frac{203}{202+203+204}\)( 3 )
Cộng vế với vế của ( 1 ), ( 2 ) và ( 3 )
=> \(\frac{201}{202}+\frac{202}{203}+\frac{203}{204}\)> \(\frac{201+202+203}{202+203+204}\)
=> A > B
Vậy A > B
Ta có : \(\frac{x+4}{200}+\frac{x+3}{201}=\frac{x+2}{202}+\frac{x+1}{203}\)
=> \(\frac{x+4}{200}+\frac{x+3}{201}-\frac{x+2}{202}-\frac{x+1}{203}=0\)
=> \(\frac{x+4}{200}+1+\frac{x+3}{201}+1-\frac{x+2}{202}-1-\frac{x+1}{203}-1=0\)
=> \(\frac{x+204}{200}+\frac{x+204}{201}-\frac{x+204}{202}-\frac{x+204}{203}=0\)
=> \(\left(x+204\right)\left(\frac{1}{200}+\frac{1}{201}-\frac{1}{202}-\frac{1}{203}\right)=0\)
=> \(x+204=0\)
=> \(x=-204\)
Vậy phương trình có tập nghiệm là S = { -204 }
<=> (2-x/201 + 1) + (x/203 - 1) = (1-x/202 + 1) + (1-1)
<=> 203-x/201 + x-203/203 = 203-x/202
<=> 203-x/201 - 203-x/203 - 203-x/202 = 0
<=> (203-x).(1/201-1/203-1/202) = 0
<=> 203-x = 0 ( vì 1/201-1/203-1/202 khác 0 )
<=> x=203
Vậy x=203
k mk nha
Xét B = \(\frac{201+202+203}{202+203+204}\)
= \(\frac{201}{202+203+204}\)+ \(\frac{202}{202+203+204}\)+ \(\frac{203}{202+203+204}\)
Vì 202 < 202 + 203 + 204 nên \(\frac{201}{202}\)>\(\frac{201}{202+203+204}\)(1)
Vì 203 < 202 + 203 + 204 nên \(\frac{202}{203}\)> \(\frac{202}{202+203+204}\)(2)
Vì 204 < 202 + 203 + 204 nên \(\frac{202}{203}\)>\(\frac{202}{202+203+204}\)(3)
Cộng vế vơi vế của (1) , (2) và (3)
=>\(\frac{201}{202}+\frac{202}{203}+\frac{203}{204}\)> \(\frac{201+202+203}{202+203+204}\)
=> A > B
Vậy A > B
\(\frac{x+5}{200}+\frac{x+4}{201}=\frac{x+3}{202}+\frac{x+2}{203}\)
=> \(\left(1+\frac{x+5}{200}\right)+\left(1+\frac{x+4}{201}\right)=\left(1+\frac{x+3}{202}\right)+\left(1+\frac{x+2}{203}\right)\)
=> \(\frac{x+205}{200}+\frac{x+205}{201}=\frac{x+205}{202}+\frac{x+205}{203}\)
=> \(\frac{x+205}{200}+\frac{x+205}{201}-\frac{x+205}{202}-\frac{x+205}{203}=0\)
=> \(\left(x+205\right).\left(\frac{1}{200}+\frac{1}{201}-\frac{1}{202}-\frac{1}{203}\right)=0\)
Do \(\frac{1}{200}>\frac{1}{202};\frac{1}{201}>1-\frac{1}{203}\)
=> \(\frac{1}{200}+\frac{1}{201}-\frac{1}{202}-\frac{1}{203}\ne0\)
=> \(x+205=0\)
=> \(x=-205\)
\(\frac{x+5}{200}+\frac{x+4}{201}=\frac{x+3}{202}+\frac{x+2}{203}\)
\(=>\frac{x+5+200}{200}+\frac{x+4+201}{201}-\frac{x+3+202}{202}-\frac{x+2+203}{203}=0\)
\(=>\frac{x+205}{200}+\frac{x+205}{201}-\frac{x+205}{202}-\frac{x+205}{203}=0\)
\(=>\left(x+205\right).\left(\frac{1}{200}+\frac{1}{201}-\frac{1}{202}-\frac{1}{203}\right)=0\)
\(Do:\frac{1}{200}+\frac{1}{201}-\frac{1}{202}-\frac{1}{203}\ne0\)
\(=>x+205=0\)
\(=>x=-205\)
Ta có :
202203 = 8 242 408101 ( 1 )
203202 = 42 209101 ( 2 )
Từ ( 1 ) và ( 2 ) suy ra 202203 < 203202
202 / x + 203 / x = 9
x = 202 + 203 / 9
x = 45
202 : x + 203 : x = 9
(202 + 203) : x = 9
405 : x = 9
x = 405 : 9
x = 45