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1206 : x + 342 : x = 6 24 x X - 15 x X = 1980
=> ( 1206 + 342 ) : x = 6 => ( 24 - 15 ) x X = 1980
=> 1548 : x = 6 => 9 x X = 1980
=> x = 1548 : 6 => x = 1980 : 9
=> x = 258 => x = 220
*** ủng hộ mik nha bạn !!!
a)1206/x+342/x=6
1206*1/x+342*1/x=6
(1206+342)*1/x=6
1548*1/x=6
1/x=1548/6
1/x=258
x=1/258
b)24*x-15*x=1980
(24-15)*x=1980
9*x=1980
x=1980/9
x=220
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X x X : 2 = 15
x2 : 2 = 15
x2 = 15 x 2
x2 = 30
=> x = Căn bậc 2 của 30
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\(\frac{15}{24}=\frac{x}{32}\Rightarrow x=\frac{15.32}{24}=20\)
Vậy x = 20
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đề bài sai sao ý 9/15 mà nếu 9/ 16 thì ko tính thận tiện đc
\(\dfrac{10}{15}\)x\(\dfrac{9}{16}+\dfrac{7}{15}\)x\(\dfrac{10}{15}\)
=> \(\dfrac{10}{15}\)x\(\left(\dfrac{9}{16}+\dfrac{7}{15}\right)\)
=> \(\dfrac{10}{15}\)x\(\dfrac{247}{240}\)
=> \(\dfrac{247}{360}\)
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24xX-15=1980
24xX=1980+15
24xX=1995
X=1995:24
X=83,125
Vậy X=83,125