nhanh bn nhé!!!!!
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\(10^{26}\) và \(9^{10}\)
Có: \(10>9\)
\(26>10\)
\(\Rightarrow10^{26}>9^{10}\)
C2: \(10^{26}=10^{10}.10^{16}\)
Vì: \(10^{10}>9^{10}\)
\(\Rightarrow10^{10}.10^{16}>9^{10}\)
\(\Rightarrow10^{26}>9^{10}\)
C1 10 ^ 26 = 100 ^ 25 = (100^5)^5 = 10000000000 ^ 5 > 81 ^ 5 = 9 ^10 => 10 ^ 26 > 9 ^ 10
C2 10 ^ 26 > 10^10 > 9^ 10 => 10 ^ 26 > 9 ^ 10
a)\(\dfrac{2}{3}+\dfrac{1}{-4}-\dfrac{5}{18}=\dfrac{8}{12}-\dfrac{3}{12}-\dfrac{5}{18}=\dfrac{5}{18}-\dfrac{5}{18}=\dfrac{5}{36}\)
b)\(=\dfrac{5}{8}+\dfrac{3}{4}-\dfrac{9}{8}=\left(\dfrac{5}{8}-\dfrac{9}{8}\right)+\dfrac{3}{4}=--\dfrac{2}{4}+\dfrac{3}{4}=\dfrac{1}{4}\)
c)\(=\dfrac{6}{7}+\dfrac{1}{7}:\left(-\dfrac{21}{28}+\dfrac{24}{28}\right)=\dfrac{6}{7}+\dfrac{1}{7}\times\dfrac{28}{3}=\dfrac{6}{7}+\dfrac{4}{3}=\dfrac{46}{21}\)
e)\(=\dfrac{9}{17}-\dfrac{5}{13}-\dfrac{8}{13}+\dfrac{1}{17}=\left(\dfrac{9}{17}+\dfrac{1}{17}\right)+\left(-\dfrac{5}{13}-\dfrac{8}{13}\right)\)
\(=\dfrac{8}{17}-1=-\dfrac{9}{17}\)
25 x 2 + 25 x 3 + 25 x 4 + 25
= 25 x (2 + 3 + 4 + 1)
= 25 x 10
= 250
**** cho mình nhé >_<
25x2+25x3+25x4+25
= 25 × 2 + 25 × 3 + 25 × 4 + 25 × 1
= 25 × ( 2 + 3 + 4 + 1 )
= 25 × 10
= 250
Nếu mình đúng thì các bạn k mình nhé
số học sinh xếp loại văn hóa giỏi là
50:10x3=15(h/sinh)
số học sinh còn lại là
50-15=35(h/sinh)
số học sinh loại khá là
35:8x3=
`-1 5/27-(3x-7/9)^3=-24/27`
`-32/27-(3x-7/9)^3=-24/27`
`(3x-7/9)^3=-8/27`
`(3x-7/9)^3=(-2/3)^3`
`3x-7/9=-2/3`
`3x=1/9`
`x=1/27`
`=>(3x-7/9)^3=-32/27+24/27`
`(3x-7/9)^3=-8/27`
`(3x-7/9)^3=(-2/3)^3`
`=>3x-7/9=-2/3`
`=>3x=-2/3+7/9`
`=>3x=-1/9`
`=>x=-1/27`
\(=\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{50}+\dfrac{1}{51}-\dfrac{102}{51\cdot52}\)
\(=\dfrac{1}{2}+\dfrac{1}{51}-\dfrac{102}{51\cdot52}\)
\(=\dfrac{1}{2}+\dfrac{52-102}{51\cdot52}=\dfrac{1}{2}+\dfrac{-50}{51\cdot52}=\dfrac{319}{663}\)
She often reads books before going to bed.
She often reads books before going to bed