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a)\(2x-138=3^2.2^3\)
\(2x-138=72\)
\(x=105\)
b)\(x=2^4+3^2.3^2\)
\(x=16+81\\ x=97\)
c)\(6x-39=\frac{588}{28}\\ 6x-39=21\\ x=10\)
\(\frac{\left(-2\right)^3.3^3.5^3.7.8}{3.5^3.2^4.42}\)
\(=\frac{\left(-2\right)^3.3^3.5^3.7.2^3}{3.5^3.2^4.2.3.7}=\frac{\left(-2\right)^3.3^3.5^3.7.2^3}{3^2.5^3.2^5.7}=\frac{-2.3}{1}=-6\)
học tốt~~~
a) \(2\left(3x-4\right)=18\Leftrightarrow3x-4=9\)
\(\Leftrightarrow3x=13\Rightarrow x=\frac{13}{3}\)
b) \(\left(105-x\right)\div25=30+1\)
\(\Leftrightarrow105-x=775\)
\(\Leftrightarrow x=-670\)
c) \(2x-138=22.32\)
\(\Leftrightarrow x-69=11.32\)
\(\Leftrightarrow x-69=352\)
\(\Rightarrow x=421\)
d) \(\left(6x-9\right).28=5628\)
\(\Leftrightarrow\left(2x-3\right).84=5628\)
\(\Leftrightarrow2x-3=67\)
\(\Leftrightarrow2x=70\)
\(\Rightarrow x=35\)
e) \(\left(9x+2\right).3=60\)
\(\Leftrightarrow9x+2=20\)
\(\Leftrightarrow9x=18\)
\(\Rightarrow x=2\)
g) \(\left(26-3x\right)\div5+71=75\)\(\Leftrightarrow26-3x=20\)
\(\Leftrightarrow3x=6\)
\(\Rightarrow x=2\)
h) \(5x+1=125\)
\(\Leftrightarrow5x=124\)
\(\Rightarrow x=\frac{124}{5}\)
i) \(\left(x-5\right)\left(2x+8\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-5=0\\2x+8=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=5\\2x=-8\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=5\\x=-4\end{cases}}\)
\(a,\left(2600+6400\right)-3\times x=1200\)
\(9000-3\times x=1200\)
\(3\times x=9000-1200\)
\(3\times x=7800\)
\(x=7800:3\)
\(x=2600\)
\(b,\left[\left(6\times x-72\right):2-84\right]\times28=5628\)
\(\left(6\times x-72\right):2-84=5628:28\)
\(\left(6\times x-72\right):2-84=201\)
\(\left(6\times x-72\right):2=201+84\)
\(\left(6\times x-72\right):2=285\)
\(6\times x-72=285\times2\)
\(6\times x-72=570\)
\(6\times x=570+72\)
\(6\times x=642\)
\(x=107\)
\(c,2x-138=2^3:3^2\)
\(2x-138=\frac{8}{9}\)
\(2x=\frac{8}{9}+138\)
\(2x=\frac{1250}{9}\)
\(x=\frac{1250}{9}:2\)
\(x=\frac{625}{9}\)
\(d,42x=39\times42-37\times42\)
\(42x=42\times\left(39-37\right)\)
\(42x=42\times2\)
\(42x=84\)
\(x=2\)
\(-28-7.|-3\chi+15|=-70\)
\(\Rightarrow7.|-3\chi+15|=42\)
\(\Rightarrow|-3\chi+15|=6\)
\(\Rightarrow\orbr{\begin{cases}-3\chi+15=6\\-3\chi+15=-6\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}-3\chi=-9\\-3\chi=-21\end{cases}}\Rightarrow\orbr{\begin{cases}\chi=3\\\chi=7\end{cases}}\)
HTDT
\(c,12-2\left(-\chi+3\right)^2=-38\)
\(\Rightarrow2\left(-\chi+3\right)^2=50\)
\(\Rightarrow\left(-\chi-3\right)^2=25\)
\(\Rightarrow\left(-\chi-3\right)^2=\left(\pm5\right)^2\)
\(\Rightarrow\orbr{\begin{cases}-\chi-3=5\\-\chi-3=-5\end{cases}}\Rightarrow\orbr{\begin{cases}\chi=-8\\\chi=-2\end{cases}}\)
HTDT
a) 2x - 138 = 32 . 23
2x - 138 = 72
2x = 72 + 138
2x = 210
x = 105
b) 6x - 39 = 588 : 28
6x - 39 = 21
6x = 21 + 39
6x = 60
x = 60 : 6 = 10
c)42 . x + 37 . 42 = 39 . 42
42 . (x + 37) = 1638
x + 37 = 1638 : 42
x + 37 = 39
x = 39 - 37
x = 2