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\(\frac{1}{2}=\frac{6}{12};\frac{1}{3}=\frac{4}{12};-\frac{1}{12}\)
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\(\frac{9}{30}=\frac{3}{10}=\frac{12}{40};\frac{98}{80}=\frac{49}{40}\)
1/2=6/12 1/3=4/12 -1/12=-1/12
9/30=3/10 98/80=49/40
3/10=12/40 49/40=49/40
\(\frac{3469-54}{6928-108}=\frac{3469-54}{2.\left(3469-54\right)}=\frac{1}{2}\)
\(\frac{2468-98}{3702-147}=\frac{2\left(1234-49\right)}{3\left(1234-49\right)}=\frac{2}{3}\)
\(\frac{2x-9}{240}=\frac{39}{80}\)
\(\Rightarrow\left(2x-9\right).80=240.39\)
\(160x-720=9360\)
\(160x=9360+720\)
\(160x=10080\)
\(x=10080:160\)
\(x=63\)
Vậy x=63
1. Ta có : \(C=\frac{1010}{1008\cdot8-994}=\frac{1010}{\left(1010-2\right)\cdot8-994}=\frac{1010}{1010\cdot8-16-994}\)
\(=\frac{1010}{1010\cdot8-1010}=\frac{1010}{1010\left(8-1\right)}=\frac{1}{7}\)
\(D=\frac{1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+5\cdot10\cdot15}{1\cdot3\cdot6+2\cdot6\cdot12+3\cdot9\cdot18+5\cdot15\cdot30}\)
\(D=\frac{1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+5\cdot10\cdot15}{1\cdot2\cdot3\cdot3+2\cdot4\cdot6\cdot3+3\cdot6\cdot9\cdot3+5\cdot10\cdot15\cdot3}\)
\(D=\frac{1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+5\cdot10\cdot15}{3\left(1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+5\cdot10\cdot15\right)}=\frac{1}{3}\)
2. \(\frac{2x-9}{240}=\frac{39}{80}\)
=> \(\frac{2x-9}{240}=\frac{39\cdot3}{80\cdot3}=\frac{117}{240}\)
=> 2x - 9 = 117
=> 2x = 117 + 9 = 126
=> x = 126 : 2 = 63
A = \(\frac{3469-54}{6938-108}\)
= \(\frac{3469-54}{2\left(3469-54\right)}\)
= \(\frac{1}{2}\)
B = \(\frac{2468-98}{3702-147}\)
= \(\frac{2\left(1234-49\right)}{3\left(1234-49\right)}\)
= \(\frac{2}{3}\)
BCNN(2,3) = 6
\(\frac{1}{2}=\frac{1.3}{2.3}=\frac{3}{6}\)
\(\frac{2}{3}=\frac{2.2}{3.2}=\frac{4}{6}\)
\(A=\frac{3469-54}{6938-108}=\frac{3469-54}{3469.2-54.2}=\frac{3469-54}{2.\left(3469-54\right)}=\frac{1}{2}=\frac{1.3}{2.3}=\frac{3}{6}\)
\(B=\frac{2468-98}{3702-147}=\frac{1234.2-49.2}{1234.3-49.3}=\frac{2.\left(1234-49\right)}{3.\left(1234-49\right)}=\frac{2}{3}=\frac{2.2}{3.2}=\frac{4}{6}\)
a. \(-\frac{15}{90}=-\frac{1}{6};\frac{120}{600}=\frac{1}{5};-\frac{75}{150}=-\frac{1}{2}\)
Mẫu chung: 30
\(-\frac{1}{6}=-\frac{5}{30};\frac{1}{5}=\frac{6}{30};-\frac{1}{2}=-\frac{15}{30}\)
b. \(\frac{54}{-90}=\frac{3}{-5}=-\frac{3}{5};-\frac{180}{288}=-\frac{5}{8};\frac{60}{-135}=\frac{4}{-9}=-\frac{4}{9}\)
Mẫu chung: 360
\(-\frac{3}{5}=-\frac{216}{360};-\frac{5}{8}=-\frac{225}{360};-\frac{4}{9}=-\frac{160}{360}\).
bài 1
a, 1/4giowf b,5/3 giờ
bài 3
-6/17=-6/17 -25/75=-1/3 42/-98=24/-49 -12/27=-4/9
bài 2 dài lắm bạn ơi ,mình chỉ giúp đc vậy thôi