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20/50 + 5/15 72/90 + 7/28 32/96 + 8/28
= 2/5 + 1/3 = 4/5 + 1/4 = 1/3 + 2/7
= 11/15 = 21/20 = 13/21
\(\frac{20}{50}+\frac{5}{15}\\ =\frac{2}{5}+\frac{1}{3}\\ =\frac{6}{15}+\frac{5}{15}=\frac{11}{15}\)
3/5+4/6=3/5+2/3=9/15+10/15=19/15
7-1/3=20/3
5x3/8=15/8
12/35:2/5=12/35x5/2=60/70=6/7
\(\dfrac{3}{5}+\dfrac{4}{6}=\dfrac{3}{5}+\dfrac{2}{3}=\dfrac{19}{15}\)
\(7-\dfrac{1}{3}=\dfrac{20}{3}\)
\(5x\dfrac{3}{8}=\dfrac{15}{8}\)
\(\dfrac{12}{35}:\dfrac{2}{5}=\dfrac{12}{35}x\dfrac{5}{2}=\dfrac{6}{7}\)
TL
\(\frac{3}{15}\)-\(\frac{5}{35}\)=\(\frac{1}{5}\)\(-\frac{1}{7}\)=\(\frac{2}{35}\)
\(\frac{18}{27}\)-\(\frac{2}{6}\)=\(\frac{2}{3}\)-\(\frac{1}{3}\)=\(\frac{1}{3}\)
nha bn
HT
A. \(\frac{2}{5}\div\frac{2}{3}=\frac{2}{5}\times\frac{3}{2}=\frac{2\times3}{5\times2}=\frac{3}{5}\text{ }\)
B. \(\frac{4}{7}\div\frac{4}{5}=\frac{4}{7}\times\frac{5}{4}=\frac{4\times5}{7\times4}=\frac{5}{7}\)
C. \(\frac{1}{6}\div\frac{1}{3}=\frac{1}{6}\times\frac{3}{1}=\frac{3}{6}=\frac{1}{2}\)
D. \(\frac{1}{4}\div\frac{1}{8}=\frac{1}{4}\times\frac{8}{1}=\frac{8}{4}=2\)
rút gọn phân số :
4/5+21/15=4/5+7/5=11/5
8/9-25/45=8/9-5/9=3/9
tính :
5/6+2/7+15/6=5/6+15/6+2/7
=10/3+2/7=76/21
7/8-9/6.7/8=7/8-21/16=-7/16
chúc bạn học tốt !!!
a) 2/5+9/5=11/5
b) 15/45+25/30=7/6
c) 28/32+45/72=3/2
d) 8/28+5/30=19/42
bài 2
a) x - 4/5 =4/5 + (3/7+3/5)
x-4/5=4/5+36/35
x-4/5=64/35
x=64/35+4/5
x=92/35
b) x-7/35=4/5
x=4/5+7/35
x=1
nhớ tk m nhé
a = 18/5
b = 3/9 + 5/6 = 6/18 + 25/18 = 31/18
c = 7/8 + 5/8 = 12/8
d = 4/14 + 1/6 = 14/42 + 7/42 = 21/42 -= 7/14
b2
x - 4/5 = 4.5 + ( 3/7 + 3/5 )
x - 4/5 = 49/35
x = 49/35 + 4/5
x = 77/35
x - 7/35 = 4/5
x = 4/5 + 7/35
x = 1
mình ko chắc chắn đâu
mình nghĩ mình làm sai
\(\frac{48}{54}-x=\frac{7}{8}\Rightarrow\frac{8}{9}-x=\frac{7}{8}\)
\(\Rightarrow x=\frac{8}{9}-\frac{7}{8}=\frac{8\cdot8-9\cdot7}{72}=\frac{1}{72}\)
Vậy \(x=\frac{1}{72}\)
\(\frac{55}{60}-x=\frac{30}{45}\Rightarrow\frac{11}{12}-x=\frac{2}{3}\)
\(\Rightarrow\frac{11}{12}-\frac{12x}{12}=\frac{8}{12}\)
\(\Rightarrow11-12x=8\)
\(\Rightarrow12x=3\)
\(\Rightarrow4x=1\Rightarrow x=\frac{1}{4}\)
Vậy \(x=\frac{1}{4}\)
\(\frac{55}{100}\)\(=\frac{55:5}{100:5}\)\(=\frac{11}{20}\)
45/55 x 5/8 = 9/11 x 5/8 = 45/88
HT
Rút gọn phân số \(\frac{45}{55}=\frac{9}{11}\)
\(\frac{9}{11}\times\frac{5}{8}=\frac{45}{88}\)