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\(\frac{3}{15}+\frac{4}{5}\)
\(\frac{3}{15}+\frac{4}{5}=\frac{1}{5}+\frac{4}{5}=\frac{5}{5}=1\)
Vậy \(\frac{3}{15}+\frac{4}{5}=1\)
\(\frac{3}{15}+\frac{4}{5}=\frac{1}{5}+\frac{4}{5}=\frac{5}{5}=1\)
trả lời
5+9x11=5+99=104
hok tốt
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trả lời
5+9x11=5+99=104
hok tốt
,./,./,./,./,./,./,./,./,./,././,.,.,.//////
1) (3x+5).(2x-7)=0=>\(\orbr{\begin{cases}x=\frac{7}{2}\\x=\frac{-5}{3}\end{cases}}\)
2) (-5x+2).(-3x-4)=0=>\(\orbr{\begin{cases}x=\frac{-4}{3}\\x=\frac{2}{5}\end{cases}}\)
3) (x-5). (4x-3)=0=>\(\orbr{\begin{cases}x=5\\x=\frac{3}{4}\end{cases}}\)
a, \(-\frac{2}{5}+\frac{5}{3}\left(\frac{3}{2}-\frac{4}{15}x\right)=\frac{7}{6}\)
\(\frac{5}{3}\left(\frac{3}{2}-\frac{4}{15}x\right)=\frac{47}{30}\)
\(\frac{3}{2}-\frac{4}{15}x=\frac{47}{50}\)
\(\frac{4}{15}x=\frac{14}{25}\)
\(x=\frac{21}{10}\)
b: A=1/3+1/9+...+1/3^10
=>3A=1+1/3+...+1/3^9
=>A*2=1-1/3^10=(3^10-1)/3^10
=>A=(3^10-1)/(2*3^10)
c: C=3/2+3/8+3/32+3/128+3/512
=>4C=6+3/2+...+3/128
=>3C=6-3/512
=>C=1023/512
d: A=1/2+...+1/256
=>2A=1+1/2+...+1/128
=>A=1-1/256=255/256
1. 2006/987654321 + 2007/246813579 = 2007/246813579 + 2006/987654321
=>
2.
3 - (5.3/8 + X - 7 . 5/24) : 6 . 2/3 =2
3 - (15/8 + X - 35/24) : 4 = 2
3 - (15/8 + X - 35/24) = 2 . 4
3 - (15/8 + X - 35/24) = 8
15/8 + X - 35/24 = 3 - 8
15/8 + X - 35/24 = -5
15/8 + X = -5 + 35/24
15/8 + X = -85/24
X = -85/24 - 15/8
X = -65/12
tính nhanh p/s 1+ 5/4 + 5/8 + 5/16 + 5/32 + 5/64
\(\dfrac{6}{5}+\dfrac{1}{10}=\dfrac{12}{10}+\dfrac{1}{10}=\dfrac{13}{10}\)
\(\dfrac{4}{3}-\dfrac{5}{12}=\dfrac{16}{12}-\dfrac{5}{12}=\dfrac{11}{12}\)
\(\dfrac{8}{5}\times3=\dfrac{8\times3}{5}=\dfrac{24}{5}\)
\(\dfrac{2}{3}\div\dfrac{4}{3}=\dfrac{2}{3}\times\dfrac{3}{4}=\dfrac{6}{12}=\dfrac{1}{2}\)