x +54 =96 ;x = bao nhieu
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a) 182 – (96 – 54) = 182 – 42
= 140
b) 7 x (48 : 6) = 7 x 8
= 56
30+{96-3.[54-2.(32+6)]}.x =79
30+{96-3.[54-2.15]}.x=79
30+{96-3.[54-30]}.x=79
30+{96-3.24}.x=79
30+{96-72}.x=79
30+24.x=79
24.x=79-30
24x=49
x=49/24
\(30+\left\{96-3.\left[54-2\left(3^2+6\right)\right]\right\}.x=78\)
\(30+\left\{96-3.\left[56-2.15\right]\right\}.x=78\)
\(30+\left\{96-3.\left[56-30\right]\right\}.x=78\)
\(30+\left\{96-3.26\right\}.x=78\)
\(30+\left\{96-78\right\}.x=78\)
\(30+18.x=78\)
\(\Rightarrow18.x=48\)
\(\Rightarrow x=\frac{8}{3}\)
học tốt
\(30+\left\{96-3.\left[54-2.\left(3^{2+6}\right)\right]\right\}.x=79\)
\(30+\left\{96-3.\left[54-2.6561\right]\right\}.x=79\)
\(30+\left\{96-3.\left[54-13122\right]\right\}.x=79\)
\(30+\left\{96-3.-13068\right\}.x=79\)
\(30+\left\{96--39204\right\}.x=79\)
\(30+39300.x=79\)
\(39300.x=79-30\)
\(39300.x=49\)
\(\Rightarrow x=\frac{39300}{49}\)
a)\(18-|x|=8\Rightarrow|x|=10\Rightarrow x\in\left\{-10;10\right\}\)
b)\(|x|+42=91\Rightarrow|x|=49\Rightarrow x\in\left\{-49;49\right\}\)
c)\(|x|-\left(-54\right)=96\Leftrightarrow|x|+54=96\Rightarrow|x|=42\Rightarrow x\in\left\{-42;42\right\}\)
d)\(|x|-\left(-15\right)=47\Leftrightarrow|x|+15=47\Rightarrow|x|=32\Rightarrow x\in\left\{-32;32\right\}\)
\(a,\) nếu \(x\ge0\) nếu \(x< 0\)
<=> 18 - / x / = 8 <=> 18 - / x / = 8
<=> 18 - x = 8 <=> 18 - ( - x ) = 8
<=> x = 18 - 8 <=> 18 + x = 8
<=> x = 10 <=> x = 8 - 18
<=> x = -10
câu b,c,d tương tự nha
x+54=96
=>x=96-54
x=42
x=42