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\(\left(\frac{14}{5}x-50\right)\div\frac{2}{3}=51\)
\(\Leftrightarrow\frac{14}{5}x-50=51\times\frac{2}{3}\)
\(\Leftrightarrow\frac{14}{5}x-50=34\)
\(\Leftrightarrow\frac{14}{5}x=34+50\)
\(\Leftrightarrow\frac{14}{5}x=84\)
\(\Leftrightarrow x=84\div\frac{14}{5}\)
\(\Leftrightarrow x=84\times\frac{5}{14}\)
\(\Leftrightarrow x=30\)
\(\left(\frac{14}{5}.x-50\right):\frac{2}{3}=51\)
\(\frac{14}{5}.x-50=51.\frac{2}{3}\)
\(\frac{14}{5}.x-50=34\)
\(\frac{14}{5}.x=34+50\)
\(\frac{14}{5}.x=84\)
\(x=84:\frac{14}{5}\)
\(x=30\)
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88 - 11(8-50)
= 88 - 11 . ( -42 )
= 88 - ( -462 )
= 88 + 462
= 550
125 . ( -24 ) . ( -5 ) . ( -8 ) . 25
= [ 125 . ( -8 ) ] . [ 25 . ( -24 ) ] . ( -5 )
= ( -1000 ) . ( -600 ) . ( -5 )
= 600000 . ( -5 )
= -3000000
125 . ( -24 ) . ( -5 ) . ( -8 ) . 25
= [ 125 . ( -8 ) ] . [ 25 × ( -24 ) ] . 5
= -1000 . ( -600 ) . 5
= 600 000 . 5
= 3 000 000
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Lời giải :
\(BCNN\left(25,42,60\right)=2100\)
\(BCNN\left(120,140,160\right)=3360\)
Bài 1:
25 = 52
42 = 2.3.7
60 = 22.3.5
=> BCNN(25; 42; 60) = 52.3.7.22 = 2100
Bài 2:
120 = 23.3.5
140 = 22.5.7
160 = 25.5
=> BCNN(120; 140; 160) = 25.3.5.7 = 3360
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\(\frac{4}{3}B=-1+\frac{3}{4}-\left(\frac{3}{4}\right)^2+...+\left(\frac{3}{4}\right)^{99}\)
\(B=-\frac{3}{4}+\left(\frac{3}{4}\right)^2-\left(\frac{3}{4}\right)^3+...+\left(\frac{3}{4}\right)^{100}\)
\(\Rightarrow\)\(\frac{7}{3}B=-1+\left(\frac{3}{4}\right)^{100}\Rightarrow B=\frac{\left(\frac{3}{4}\right)^{100}-1}{\frac{7}{3}}=\frac{3\left[\left(\frac{3}{4}\right)^{100}-1\right]}{7}\)
Như vầy đủ gọn chưa bạn?
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25 của 50 12,5 nha k mình đi
25% của 50 là: 50 x 25 : 100 = 12,5