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Ta có:
\(min\left\{\left(2007+2005\right):\left(x-4\right)\right\}\)
\(=min\left\{4012:\left(x-4\right)\right\}\)
\(\Rightarrow min\left\{x-4\left(\ne0\right)\right\}\)
\(\Rightarrow x=3\)
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Tính nhanh: 35 \(\times\) 119 \(\times\) 0,25 \(\times\) 100 \(\times\) ( 3: 0,4 - 7,5)
= 35 \(\times\) 119 \(\times\) 0,25 \(\times\) 100 \(\times\) ( 7,5 - 7,5)
= 35 \(\times\) 119 \(\times\) 0,25 \(\times\) 100 \(\times\) 0
= 0
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\(\left(\frac{5}{7}-x\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\left(\frac{5}{7}-x\right)\cdot\frac{14}{5}=\frac{6}{5}\)
\(\left(\frac{5}{7}-x\right)=\frac{6}{5}\div\frac{14}{5}\)
\(\frac{5}{7}-x=\frac{3}{7}\)
\(x=\frac{5}{7}-\frac{3}{7}\)
\(x=\frac{2}{7}\)
\(\left(\frac{5}{7}-x\right).\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
<=> \(\left(\frac{5}{7}-x\right).\frac{14}{5}=\frac{6}{5}\)
<=> \(\frac{5}{7}-x=\frac{3}{7}\)
<=> \(x=\frac{2}{7}\)
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\(x\times x-5+x:x=12\)
\(\Rightarrow x\times x-5+1=12\)
\(\Rightarrow x\times x=12+5-1\)
\(\Rightarrow x\times x=17-1\)
\(\Rightarrow x\times x=16\)
\(\Rightarrow x\times x=4\times4\)
\(\Rightarrow x=4\).
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17,8 x X = 360,05 - 93,05
17,8 x X = 267
X = 267 : 17,8
X = 15
29,5 x ( X + 10,25 ) = 376,125
X + 10,25 = 376,125 : 29,5
X + 10,25 = 12,75
X = 12,75 - 10,25
X = 2,5
748 : ( X - 31,72 ) = 13,6
X - 31,72 = 748 : 13,6
X - 31,72 = 55
X = 55 + 31,72
X = 86 , 72
207 : 31,6 = 6,55063291139
17,8 . x = 360,05 - 93,05
17,8 . x = 267
x = 267 : 17,8
x = 15
29,5 . (x + 10,25) = 376,125
(x + 10,25) = 376,125 : 29,5
x + 10,25 = 12,75
x = 12,75 - 10,25
x = 2,5
748 : (x - 31,72) = 13,6
(x - 31,72) = 748 : 13,6
x - 31,72 = 55
x = 55 + 31,72
x = 86,72
207 : 31,6 = 6,55063291139
Học tốt!!!
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\(x\times5-x:x-x=15\)
\(\Rightarrow x\times5-1-x=15\)
\(\Rightarrow x\times5-x=15+1\)
\(\Rightarrow x\times\left(5-1\right)=16\)
\(\Rightarrow x\times4=16\)
\(\Rightarrow x=16:4\)
\(\Rightarrow x=4\).
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3,7 : 0,125 + 3,7 : 0,25 + 3,7 x 88
= 3,7 : 1/8 + 3,7 : 1/4 + 3,7 x 88
= 3,7 x 8 + 3,7 x 4 + 3,7 x 88
= 3,7 x ( 8 + 4 + 88 )
= 3,7 x 100
= 370