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y x 16 - y x 5 -y =550
y x (16-5-1)=550
y x 10=550
y=550:10
y=55
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C1 : 5/24 x 5/12 x 24
= 5/24 x ( 5/12 x 24 )
= 5/24 x 10
= 50/24
= 25/12
C2 : 5/24 x 5/12 x 24
= ( 5/24 x 24 ) x ( 5/12 )
= 5 x ( 5/12 )
= 25/12
Chúc em học giỏi !!!
Cách 1 : 5/24 x 5/12 x 24 = (5/24 x 24) x 5/12
= 5 x 5/12 = 25/12
Cách 2 : 5/24 x 5/12 x 24 = 5/24 x (5/12 x 24)
= 5/24 x 10 = 25/12
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a,3535/3737-x=2121/7474
35/37-x=21/74
x=35/37-21/74
x=49/74
b,x/1968-217/984=187/492
x/1968=187/492+217/984
x/1968=197/328
x=197.1967/328
x=????
\(\frac{3535}{3737}-x=\frac{2121}{7474}\)
\(x=\frac{3535}{3737}-\frac{2121}{7474}\)
\(x=\frac{7070}{7474}-\frac{2121}{7474}\)
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\(\frac{4}{x}\)=\(\frac{2}{7}\)
=>x=\(\frac{4x7}{2}\)
<=>x=14
\(\frac{y}{21}\)=\(\frac{2}{7}\)
=>y=\(\frac{21x2}{7}\)
<=>y=6
Vậy ...........
k cho mk nha
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24 x X = 6 x 1/ 4
24 x X = 3/2
X = 3/2 : 24
X= 1/16
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49 x 123 - 49 x 22 - 49
= 49 x 123 - 49 x 22 - 49 x 1
= 49 x ( 123 - 22 - 1 )
= 49 x 100
= 4900
nhiều số
1 và 0 nha