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\(\frac{x+140}{x+260}=71+65.4\)
\(\Leftrightarrow\frac{x+140}{x+260}=71+260\)
\(\Leftrightarrow\frac{x+140}{x+260}=331\)
\(\Leftrightarrow x+140=\left(x+260\right)331\)
\(\Leftrightarrow x+140=86060+331x\)
\(\Leftrightarrow x-331x=85920\)
\(\Leftrightarrow x\left(331-1\right)=85920\)
\(\Leftrightarrow x330=85920\)
\(\Leftrightarrow x\approx260,2\)
71 + 65 x 4 = x + 140/x + 260
x + 140/x + 260 = 71 + 65 x 4
x + 140/x + 260 = 71 + 260
x + 140/x = 71
x/x + 140/x = 71
1 + 140/x = 71
140/x = 71 - 1
140/x = 70
x = 140/70
x = 2
Trả lời:
71+65.4=x+140/x+260
x+140/x+260=71+65.4
x+140/x+260=71+260
x+140/x=71
x/x+140/x=71
1+140/x=71
140/x=71-1
140/x=70
x=140/70
x=2
vậy x=2
cậu ơi cái chỗ 71+65x4 là nhân 4 hay là 65 nhân x nhân 4 ạ
5/4-yx5/6=-1/12
5/4-y = -1/12:5/6
5/4-y = -1/10
y = 5/4-(-1/10)
y = 27/20
\(\frac{5}{4}-y.\frac{5}{6}=\frac{1}{4}-\frac{1}{3}\)
\(\Rightarrow\frac{5}{4}-y.\frac{5}{6}=-\frac{1}{12}\)
\(\Rightarrow y.\frac{5}{6}=\frac{5}{4}-\left(-\frac{1}{12}\right)\)
\(\Rightarrow y.\frac{5}{6}=\frac{5}{4}+\frac{1}{12}\)
\(\Rightarrow y.\frac{5}{6}=\frac{4}{3}\)
\(\Rightarrow y=\frac{4}{3}:\frac{5}{6}\)
\(\Rightarrow y=\frac{8}{5}\)
Vậy \(y=\frac{8}{5}.\)
\(\frac{x+140}{x+260}=71+65\times4\)
\(\Rightarrow\frac{x+260-120}{x+260}=331\)
\(\Rightarrow1-\frac{120}{x+260}=331\)
\(\Rightarrow\frac{120}{x+260}=-330\)
\(\Rightarrow x+260=\frac{120}{-330}\)
\(\Rightarrow x+260=\frac{-4}{11}\)
\(\Rightarrow x=\frac{-4}{11}-260=-\frac{4}{11}-\frac{2860}{11}=\frac{-2864}{11}\)
\(\frac{x+140}{x+260}=71+65.4\)
<=> \(\frac{x+140}{x-260}=331\)
<=> \(\frac{x+140}{x-260}=\frac{331x-86060}{x-260}\)
,<=> \(x+140=331x-86060\)
<=> \(-330x=-86200\)
<=> \(x=\frac{8620}{33}\)