2252545+2525+2525
2525+5252+2524
=
=
2525+252+252
=
=
81+243+19
(x-2525-2525)+6262+321=10000
315*(46-x)=401
49*313+187*7^2+350
250-160-(18-12)^2
81 + 243 + 19
= ( 81 + 19 ) + 243
= 100 + 243
= 343
( x - 2525 - 2525 ) +6262 + 321 = 10000
( x - 5050 ) + 6583 = 10000
x - 5050 = 3417
x = 8467
315 \(x\)(46-x) = 401
46 - x = \(\frac{401}{305}\)
-x =\(-\frac{13629}{305}\)
x = \(\frac{13629}{305}\)
49 \(x\)313 + 187 \(x\)72 +350
=14398 + 9163 + 350
=23911
250 - 160 - ( 18 - 12 ) 2
= 90 - 62
=54
2323/2525+212121/252525
\(\frac{2323}{2525}+\frac{212121}{252525}\)
\(=\frac{23\times101}{25\times101}+\frac{21\times10101}{25\times10101}\)
\(=\frac{23}{25}+\frac{21}{25}\)
\(=\frac{44}{25}\)
\(\frac{2323}{2525}+\frac{212121}{252525}\)
\(=\)\(\frac{23}{25}+\frac{21}{25}\)
\(=\frac{44}{25}\)
So sánh: -2525/2929 và -217/245
2929/2525 x 505050/848484 x 42/29
\(\dfrac{2929}{2525}\cdot\dfrac{505050}{848484}\cdot\dfrac{42}{29}\)
\(=\dfrac{29}{25}\cdot\dfrac{50}{84}\cdot\dfrac{42}{29}\)
\(=\dfrac{29}{29}\cdot\dfrac{50}{25}\cdot\dfrac{42}{84}=1\cdot2\cdot\dfrac{1}{2}=1\)
so sánh 1717/2525 và 515151/727272
ta có: \(\frac{1717}{2525}=\frac{17}{25}\)
\(\frac{515151}{727272}=\frac{51}{72}=\frac{17}{24}>\frac{17}{25}\)
\(\Rightarrow\frac{1717}{2525}< \frac{515151}{727272}\)
Ta có:
\(\frac{1717}{2525}=\frac{17}{25}\)
\(\frac{515151}{727272}=\frac{51}{72}=\frac{17}{24}\)
Mà: \(\frac{17}{25}< \frac{17}{24}\)
\(\Rightarrow\frac{1717}{2525}< \frac{515151}{727272}\)
So sánh 1515/2525........3/5
Giá trị của biểu thức 2 5 25 - 9 2 16 81 + 169 là:
A. 12
B. 13
C. 14
D. 15