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Bài 1:
a) \(2\frac{1}{4}+1\frac{1}{2}-1\frac{4}{5}\)
=\(\frac{9}{4}\)+\(\frac{3}{2}\)-\(\frac{9}{5}\)
=\(\frac{45}{20}+\frac{30}{20}-\frac{36}{20}\)
=\(\frac{39}{20}\)
b) \(2\frac{2}{3}\times3\frac{1}{4}:2\frac{3}{4}\)
\(\frac{8}{3}\times\frac{13}{4}:\frac{11}{4}\)
=\(\frac{8}{3}\times\frac{13}{4}\times\frac{4}{11}\)
=\(\frac{104}{33}\)
Bài 2:
a) \(\frac{7}{9}+\frac{4}{5}+\frac{11}{9}+\frac{6}{5}\)
=\(\left(\frac{7}{9}+\frac{11}{9}\right)+\left(\frac{4}{5}+\frac{6}{5}\right)\)
=2+2
=4
b) \(\frac{21}{36}\times\frac{39}{14}\times\frac{54}{13}\)
=\(\frac{21\times39\times54}{36\times14\times13}\)
=\(\frac{675}{100}\)
Ta có :
\(\frac{1}{2}=1\div2=0,5\)
\(\frac{2}{3}=2\div3=0,666...\)
\(\frac{3}{4}=3\div4=0,75\)
\(\frac{4}{5}=4\div5=0,8\)
\(\frac{5}{6}=5\div6=0,8333...\)
\(\frac{6}{7}=6\div7=0,8671...\)
\(\frac{7}{8}=7\div8=0,875\)
\(\frac{8}{9}=8\div9=0,888...\)
Vậy các phân số có thể là : \(\frac{1}{2};\frac{3}{4};\frac{4}{5};\frac{7}{8}\)
\(2\dfrac{3}{4}=\dfrac{2\times4+3}{4}=\dfrac{11}{4}\\ 3\dfrac{4}{5}=\dfrac{3\times5+4}{5}=\dfrac{19}{5}\\ 4\dfrac{3}{5}=\dfrac{4\times5+3}{5}=\dfrac{23}{5}\\ 11\dfrac{12}{13}=\dfrac{11\times13+12}{13}=\dfrac{155}{13}\\ 12\dfrac{11}{13}=\dfrac{12\times13+11}{13}=\dfrac{167}{13}\\ 3\dfrac{3}{5}=\dfrac{3\times5+3}{5}=\dfrac{18}{5}\)
2\(\dfrac{3}{4}\)=\(\dfrac{11}{4}\)
3\(\dfrac{4}{5}\)=\(\dfrac{19}{5}\)
4\(\dfrac{3}{5}\)=\(\dfrac{23}{5}\)
11\(\dfrac{12}{13}\)=\(\dfrac{155}{13}\)
12\(\dfrac{11}{13}\)=\(\dfrac{167}{13}\)
3\(\dfrac{3}{5}\)=\(\dfrac{18}{5}\).
a) 28/140=0.2 b) 2 23/75=2.3066
33/75=0.44 4 216/900=4.24
261/900=0.29 1 415/1250=1.332
415/1250=0.332 5 28/140=5.2
\(5\frac{9}{7}\)\(=\)\(5\)x \(7\) + \(9\)=\(\frac{44}{7}\)
5 9/7=7*5+9/7=44/7
6 7/6=6*6+7/6=43/6
4 7/8=8*47/8=39/8
6 7/9=9*6+7/9=61/9
2 8/6=6*2+8/6=20/6
huhu mk mới hoklowps 4
\(\frac{13}{6}\)và \(\frac{30}{6}\)