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a.8/5 - 18/27 = 8/5 - 2/3 = 24/15 = 14/15
b. 12/20 - 6/18 = 3/5 - 1/3 = 9/15= 4/15
c. 8/24 - 5/25 = 1/3 - 1/5 = 5/15 - 3/15 = 2/15
d. 18/21 - 12/27 = 6/7 - 4/9 = 54/63 - 28/63 = 26/63
a: =8/5-2/3=24/15-10/15=14/15
b: =3/5-1/3=9/15-5/15=4/15
c: =1/3-1/5=2/15
d: =6/7-4/9=54/63-28/63=26/63
a: =8/5-2/3=24/15-10/15=14/15
b: =3/5-1/3=9/15-5/15=4/15
c: =1/3-1/5=2/15
d: =6/7-4/9=54/63-28/63=26/63
seo câu của tui lại bị xóa mất rồi bài này tui cũng làm hôm qua rùi mè sao ai lại xóa
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Bài 1:
a: =2/3+7/5=10/15+21/15=31/15
b: =3/4+1/8=6/8+1/8=7/8
c: =225/25+7/25=232/25
d: =5/8+8=64/8+5/8=69/8
\(a,x+\dfrac{2}{5}=\dfrac{1}{2}\\ x=\dfrac{1}{2}-\dfrac{2}{5}\\ x=\dfrac{1}{10}\\b,x=\dfrac{2}{5}+\dfrac{3}{7}\\ x=\dfrac{29}{35}\\ c,=\dfrac{19}{20}-\dfrac{8}{5}\\ x=\dfrac{-13}{20} \)
a: x+2/5=1/2
=>x=1/2-2/5=5/10-4/10=1/10
b: x-3/7=2/5
=>x=2/5+3/7=14/35+15/35=29/35
c: 19/20-x=8/5
=>x=19/20-8/5=19/20-32/20=-13/20