a. \(\frac{10x18}{27x15}\)
b. \(\frac{1x2x3x4x5x6}{7x8x9}\)
Tính bằng cách thuận tiện nhất
help :<
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a) 10 x 18/27 x 15
= 2 x 5 x 2 x 9/3 x 9 x 3 x 5
= 4/9.
b) 1 x 2 x 3 x 4 x 5 x 6/7 x 8 x 9
= 1 x 2 x 3 x 4 x 5 x 3 x 2/7 x 2 x 4 x 3 x 3
= 1 x 5 x 2/ 7
= 10/7
c)\(1\frac{1}{2}.1\frac{1}{3}.1\frac{1}{4}.1\frac{1}{5}\)
\(=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}.\frac{6}{5}\)
\(=3\)
d) \(1\frac{1}{2}:1\frac{1}{3}:1\frac{1}{4}:1\frac{1}{5}=\frac{3}{2}:\frac{4}{3}:\frac{5}{4}:\frac{6}{5}=\frac{3}{2}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}=\frac{3}{4}\)
2. a) 0,123; 0,132; 0,213; 0,231; 0,312; 0,321.
b) 0,321; 0,312; 0,231; 0,213; 0,132; 0,123
3. 5 số đó là; 0,11;0,12;0,13;0,14;0,15
a) 0,11;0,12;0,13;0,14;0,15
b) 0,15;0,14;0,13;0,12;0,11
\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}=\frac{2}{5}\)
\(\frac{1}{2}:\frac{3}{4}:\frac{5}{6}=\frac{1}{2}\times\frac{4}{3}\times\frac{6}{5}=\frac{1\times2\times2}{5}=\frac{4}{5}\)
Giải nè!:
a) =72/99 - 14/99 - 28/99= 30/99=10/33
b) = 83,45 - (30,98+42,47) = 83,45 - 73,45 = 10
Tích đúng cho tớ nè!
a) \(\frac{14}{15}+\frac{3}{11}+\frac{1}{15}+\frac{3}{11}+\frac{10}{22}\)
\(=\left(\frac{14}{15}+\frac{1}{15}\right)+\left(\frac{3}{11}+\frac{3}{11}\right)+\frac{10}{22}\)
\(=1+1+\frac{10}{22}\)
\(=2+\frac{10}{22}\)
\(=\frac{27}{11}\)
b) 9,25 + 9,25 x 8 + 9,25
= 9,25 x ( 8 + 1 + 1 )
= 9,25 x 10
= 92,5
\(a,\frac{2}{5}+\frac{1}{6}+\frac{3}{5}\)
\(=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{1}{6}\)
\(=1+\frac{1}{6}\)
\(=\frac{7}{6}\)
Hok tốt!~
a) \(\frac{8}{11}-\frac{28}{99}-\frac{14}{99}=\frac{72}{99}-\frac{28}{99}-\frac{14}{99}=\frac{30}{99}=\frac{10}{33}\)
b) \(5\frac{3}{4}-3\frac{1}{2}=\)\(\frac{23}{4}-\frac{7}{2}=\frac{23}{4}-\frac{14}{4}=\frac{9}{4}\)
A) 8/11- 28/99- 14/99 8/11=72/99 (72/99 +28/99)-14/99 =100/99-14/99 =86/99
\(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)
\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)
\(=\frac{15}{15}+\frac{23}{23}\)
\(=1+1=2\)
\(\frac{19}{15}+\frac{31}{23}-\frac{14}{15}-\frac{8}{23}\)
\(=\frac{19}{15}-\frac{4}{15}+\frac{31}{23}-\frac{8}{23}\)
\(=1+1=2\)
chúc bạn học giỏi
27/8 - 7/3 + 4/3 - 2
= 27/8 - (7/3 - 4/3) - 2
= 27/8 - 1 - 2
=27/8 - 3
= 3/8
\(\frac{10x18}{27x25}\) = \(\frac{2x5x2x3x3}{3x3x3x5x5}\) = \(\frac{4}{15}\)