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5/9x12/7=20/21
6/5:8/3=9/20
9/20x5/12=3/16
15/16:25/24=9/10
14x5/21=10/3
10:5/3=6
5/3:10=1/6
5/9 x 12/7 = 60/63
6/5 : 8/3 = 6/5 x 3/8 = 9/20
9/20 x 5/12 = 3/16
15/16 : 25/24 = 15/16 x 24/25 = 9/10
14 x 5/21 = 60/21
10 : 5/3 = 10 x 3/5 = 6
5/3 : 10 = 5/3 x 1/10 = 1/6
\(\dfrac{16}{27}xX=\dfrac{10}{27}-\dfrac{6}{27}\)
\(\dfrac{16}{27}xX=\dfrac{4}{27}\)
\(X=\dfrac{4}{27}:\dfrac{16}{27}\)
X=\(\dfrac{1}{4}\)
16/27x X+2/9=10/27
16/27x X=10/27-2/9
16/27x X=4/27
X=4/27:16/27
X=1/4
X/7=10/14 : X la 5
4/9=x/27 : x la 12
15/24=x/32: 15/24= 5/8: vậy X= 20
\(10000-x \times24=541\times16\)
\(10000-x\times24=8656\)
\(x\times24=10000-8656\)
\(x\times24=1344\)
`x=1344:24`
`x=56`
10 000 - X x 24 = 541 x 16
10 000 - X x 24 = 8656
X x 24 = 10 000 - 8656
X x 24 = 1344
X = 1344: 24
X = 56
a,\(\frac{4}{3}\)x \(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)
= \(\frac{5}{3}\)
b, \(\frac{4}{3}\)x \(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)x \(\frac{36}{35}\)x \(\frac{49}{48}\)x \(\frac{64}{63}\)x \(\frac{81}{80}\)
= \(\frac{9}{5}\)
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
\(\dfrac{10}{16}=\dfrac{x+9}{24}\)
\(\Leftrightarrow x=\left(\dfrac{10}{16}x24\right)-9\)
\(\Leftrightarrow x=\dfrac{240}{16}-9=6\)
\(\dfrac{10}{16}=x+\dfrac{9}{24}\)
\(\dfrac{5}{8}=x+\dfrac{3}{8}\)
\(x=\dfrac{5}{8}-\dfrac{3}{8}\)
\(x=\dfrac{2}{8}\)
\(x=\dfrac{1}{4}\)