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Trả lời :
a) \(\frac{1}{4}=25\%\)
b)\(\frac{3}{5}=60\%\)
c)\(\frac{5}{8}=62,5\%\)
d) \(\frac{15}{16}=93,75\%\)
- Study well -
4 1/2 = 4 x 2+1/2 = 9/2
3 4/5 = 3 x 5+4/5 = 19/5
2 3/4 = 2 x 4+3/4 = 11/4
1 12/25 = 1 x 25+12/25 = 37/25
Tk mk nha
mk cho bài kham khảo nha :
\(4\frac{1}{2}=\frac{9}{2}=4,5\)
\(3\frac{4}{5}=\frac{19}{5}=3,8\)
\(2\frac{3}{4}=\frac{11}{4}=2,75\)
\(1\frac{12}{25}=\frac{37}{25}=1,48\)
ok k mk nha
\(a.\frac{4}{5}=0,8=80\%\)
\(b.\frac{5}{25}=\frac{1}{5}=0,2=20\%\)
\(c.\frac{1}{4}=0,25=25\%\)
\(d.\frac{3}{10}=0,3=30\%\)
\(e.0,723=72,3\%\)
\(g.1,35=135\%\)
\(h.0,2=20\%\)
\(i.4,568=456,8\%\)
\(\frac{3}{5}=0,6\)
\(\frac{1}{4}=0,25\)
\(\frac{45}{6}=7,5\)
1)
a) \(x+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}=5\)
\(x+\frac{64}{128}+\frac{32}{128}+\frac{16}{128}+\frac{8}{128}+\frac{4}{128}+\frac{2}{128}+\frac{1}{128}=5\)
\(x+\frac{127}{128}=5\)
\(x=5-\frac{127}{128}=\frac{513}{128}\)
b) \(x+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}+\frac{1}{729}+\frac{1}{2187}=3\)
\(x+\frac{729}{2187}+\frac{243}{2187}+\frac{81}{2187}+\frac{27}{2187}+\frac{9}{2187}+\frac{3}{2187}+\frac{1}{2187}=3\)
\(x+\frac{2186}{2187}=3\)
\(x=3-\frac{2186}{2187}=\frac{4375}{2187}\)
2)
a) \(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(=1-\frac{1}{6}=\frac{5}{6}\)
b) \(5\frac{1}{2}+3\frac{5}{6}+\frac{2}{3}\)
\(=\left(5+3\right)+\left(\frac{1}{2}+\frac{2}{3}+\frac{5}{6}\right)\)
\(=8+\left(\frac{3}{6}+\frac{4}{6}+\frac{5}{6}\right)\)
\(=8+2=10\)
c) \(7\frac{7}{8}+1\frac{4}{6}+3\frac{3}{5}\)
\(=\left(7+1+3\right)+\left(\frac{7}{8}+\frac{2}{3}+\frac{3}{5}\right)\)
\(=11+\left(\frac{105}{120}+\frac{80}{120}+\frac{72}{120}\right)\)
\(=11+\frac{257}{120}=\frac{1577}{120}\)
3) Gọi số đó là x. Theo đề ta có :
\(\frac{16-x}{21+x}=\frac{5}{7}\)
\(7\left(16-x\right)=5\left(21+x\right)\)
\(112-7x=105+5x\)
\(112-105=7x-5x\)
\(7=2x\)
\(x=\frac{7}{2}=3,5\) ( vô lí )
Vậy không có số tự nhiên để thõa mãn điều kiện trên.
\(\frac{11}{2}=5,5\)
\(\frac{15}{4}=3,75\)
\(\frac{31}{5}=6,2\)
Mình đảm bảo đúng! Ai tốt bụng thì k nha!
\(8\frac{3}{5}=8,6\)
\(4\frac{13}{25}=4,52\)
\(1\frac{15}{20}=1,75\)
\(18\frac{3}{4}=18,75\)
\(8\frac{3}{5}=3,8\)
\(4\frac{13}{25}=1,08\)
\(1\frac{15}{20}=-0,25\)
\(18\frac{3}{4}=3,375\)
P/s: Mik ko chác
2/5=0,4
3/25=0.12
98/125=0.784
3/4=0,75
1/2=0,5
HT~~~
TL :
a) \(\frac{2}{5}\)= 0,4
b) \(\frac{3}{25}\)= 0,75
c) \(\frac{98}{125}\)= 0,784
d) \(\frac{3}{4}\)= 0,75
e) \(\frac{1}{2}\)= 0,5
\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}=\frac{2}{5}\)
\(\frac{1}{2}:\frac{3}{4}:\frac{5}{6}=\frac{1}{2}\times\frac{4}{3}\times\frac{6}{5}=\frac{1\times2\times2}{5}=\frac{4}{5}\)
2/5= 4/10= 0,4
3/4= 75/100= 0,75
1 3/5= 1 6/10= 1,6
2 1/4= 2 25/100= 2,25
k mk nhóe
\(\frac{2}{5}=0,4\)
\(\frac{3}{4}=0,75\)
\(1\frac{3}{5}=1,6\)
\(2\frac{1}{4}=2,25\)
\(\frac{1}{4}=40\%\)
\(\frac{3}{5}=60\%\)
\(\frac{5}{8}=62,5\%\)
\(\frac{15}{16}=93,75\%\)
Chúc em học tốt!!!