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GL
24 tháng 8 2023
a) \(\dfrac{3}{4}-\dfrac{1}{8}=\dfrac{6}{8}-\dfrac{1}{8}=\dfrac{6-1}{8}=\dfrac{5}{8}\)
b) \(\dfrac{2}{6}-\dfrac{5}{18}=\dfrac{6}{18}-\dfrac{5}{18}=\dfrac{6-5}{18}=\dfrac{1}{18}\)
c) \(\dfrac{2}{5}-\dfrac{3}{20}=\dfrac{8}{20}-\dfrac{3}{20}=\dfrac{8-3}{20}=\dfrac{5}{20}=\dfrac{1}{4}\)
NV
4
SG
18 tháng 3 2018
\(\frac{5}{12}+\frac{5}{6}-\frac{3}{4}\)
\(=\frac{5}{12}+\frac{10}{12}-\frac{9}{12}\)
\(=\frac{5+10-9}{12}\)
\(=\frac{6}{12}\)
\(=\frac{1}{2}\)
\(\frac{3}{5}+\frac{6}{4}+\frac{5}{2}\)
\(=\frac{24}{40}+\frac{60}{40}+\frac{100}{40}\)
\(=\frac{24+60+100}{40}\)
\(=\frac{184}{40}\)
Tự rứt gọn nha !
NM
1
NT
Nguyễn thành Đạt
CTVHS
20 tháng 3 2023
\(\dfrac{1}{2}\times\dfrac{3}{4}:\dfrac{6}{5}=\dfrac{3}{8}:\dfrac{6}{5}=\dfrac{5}{16}\)
\(\dfrac{2}{3}+\dfrac{1}{6}:\dfrac{7}{12}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14}{21}+\dfrac{6}{21}=\dfrac{20}{21}\)
\(8\times\dfrac{3}{5}:\dfrac{12}{5}=\dfrac{24}{5}:\dfrac{12}{5}=2\)
\(\dfrac{4}{9}+\dfrac{3}{4}-\dfrac{1}{3}=\dfrac{16}{36}+\dfrac{27}{36}-\dfrac{12}{36}=\dfrac{31}{36}\)
HK
1
20 tháng 3 2023
a: \(=\dfrac{1}{2}\cdot\dfrac{3}{4}\cdot\dfrac{5}{6}=\dfrac{15}{48}=\dfrac{5}{16}\)
b: \(=\dfrac{2}{3}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{20}{21}\)
c: \(=\dfrac{24}{5}\cdot\dfrac{5}{12}=2\)
d: \(=\dfrac{1}{9}+\dfrac{3}{4}=\dfrac{4+27}{36}=\dfrac{31}{36}\)
24 tháng 1 2022
a) \(\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{24}{60}+\dfrac{40}{60}+\dfrac{45}{60}=\dfrac{24+40+45}{60}=\dfrac{109}{60}\)
b) \(\dfrac{1}{3}+\dfrac{5}{12}+\dfrac{5}{6}=\dfrac{4}{12}+\dfrac{5}{12}+\dfrac{10}{12}=\dfrac{4+5+10}{12}=\dfrac{19}{12}\)
c) \(\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{2}{3}=\dfrac{4}{24}+\dfrac{5}{24}+\dfrac{16}{24}=\dfrac{4+5+16}{24}=\dfrac{25}{24}\)
DT
4
26 tháng 2 2022
3.<,>,=
3-5/6....>...1+5/6 41/60-11/60....=....3/8+1/8
2/5+4/15....>...9/10-3/5 1/3-1/12..<....7/8-5/16
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
1 tháng 3 2023
\(\dfrac{7}{6}\) + \(\dfrac{5}{12}\) - \(\dfrac{1}{18}\) - 1
= \(\dfrac{42}{36}\) + \(\dfrac{15}{36}\) - \(\dfrac{2}{36}\) - \(\dfrac{36}{36}\)
= \(\dfrac{19}{36}\)
\(\dfrac{13}{6}\) + \(\dfrac{5}{18}+3-\dfrac{7}{12}\)
= \(\dfrac{78}{36}+\dfrac{10}{36}+\dfrac{108}{36}-\dfrac{21}{36}\)
= \(\dfrac{175}{36}\)
3 + \(\dfrac{11}{4}-\dfrac{1}{12}-\dfrac{3}{16}\)
= \(\dfrac{144}{48}+\dfrac{132}{48}-\dfrac{4}{48}-\dfrac{9}{48}\)
= \(\dfrac{263}{48}\)
\(\dfrac{2}{5}\) x \(\dfrac{7}{4}\) - \(\dfrac{2}{5}\) x \(\dfrac{3}{4}\)
= \(\dfrac{2}{5}\) x ( \(\dfrac{7}{4}\) - \(\dfrac{3}{4}\))
= \(\dfrac{2}{5}\) x \(\dfrac{4}{4}\)
= \(\dfrac{2}{5}\)
1/3+5/12+5/6
=4/12+5/12+10/12
=19/12
ht
TL
= 19/12
NHÉ
HT