3/7.4/11+3/7.7/11-2
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\(11=\frac{77}{7}< \frac{78}{7}\Rightarrow-\frac{11}{3^7\cdot7^3}>-\frac{78}{3^7\cdot7^4}\)
có - 11/3^7.7^3 =-77/3^7.7^4 rồi so sánh với -78/3^7.7^4 nhé :))
9+3.(-5)=9+(-15)= -6
\(\frac{-2}{15}\)-\(\frac{4}{25}\)= \(\frac{-10}{75}\)-\(\frac{12}{75}\)= \(\frac{-22}{75}\)
\(\frac{-3}{5}\). \(\frac{4}{11}\)+\(\frac{-3}{7}\). \(\frac{7}{11}\)+ \(\frac{-3}{7}\)= \(\frac{-12}{55}\)+ \(\frac{-21}{77}\)+ \(\frac{-3}{7}\)
= \(\frac{-84}{385}\)+\(\frac{-105}{385}\)+\(\frac{-165}{385}\)
= \(\frac{-354}{385}\)
a) 9+3.(-5) =9-15=-6
b) \(\frac{-2}{15}-\frac{4}{25}=\frac{-2.5}{75}-\frac{4.3}{75}=\frac{-10-12}{75}=\frac{-22}{75}\)
c) \(\frac{-3}{5}.\frac{4}{11}+\frac{-3}{7}.\frac{7}{11}+\frac{-3}{7}=\frac{-12}{55}+\frac{-21}{77}+\frac{-3}{7}=\frac{-12.7}{385}+\frac{-21.5}{385}+\frac{-21.55}{385}=\frac{-84-105-1155}{385}=\frac{-1344}{385}=\frac{-192}{5}\)
hi! hi! hk bit dug hk :)
2:
=>27:3^x=2*25-16-31=50-47=3
=>3^x=27/3=9
=>3^x=3^2
=>x=2
1:
b: \(=16\cdot55+16\cdot45-1\)
=16(55+45)-1
=1600-1
=1599
c: \(=\dfrac{1800}{49-\left[2\cdot\left(36-34\right)^3-5\right]}\)
\(=\dfrac{1800}{49-2\cdot2^3+5}=\dfrac{1800}{49-16+5}=\dfrac{1800}{38}\)=900/19
d: \(=\dfrac{5\cdot3^{11}\cdot2^{11}-3^{11}\cdot2^{11}}{2^{10}\cdot3^{10}\cdot2^2\cdot3+7\cdot2^{12}\cdot3^{12}}\)
\(=\dfrac{3^{11}\cdot2^{11}\left(5-1\right)}{2^{12}\cdot3^{11}\left(1+7\cdot3\right)}=\dfrac{1}{2}\cdot\dfrac{4}{1+21}=\dfrac{4}{22\cdot2}=\dfrac{1}{11}\)
`3/7 .4/11+3/7 .7/11-2`
`= 3/7 . ( 4/11 + 7/11)-2`
`= 3/7 . 11/11 -2`
`=3/7 . 1-2`
`= 3/7-2`
`= 3/7 - 14/7`
`=-11/7`
`3/7*4/11+3/7*7/11-2`
`=3/7*(4/11+7/11)-2`
`=3/7*1-2`
`=3/7-2`
`=3/7-14/7`
`=-11/7`