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* \(3^3.4^3-3=27.64-3=1728-3=1725\)
* \(234-12=222\)
Tíck cho mìk vs nhá o0o Phương Uyên o0o!
33 x 43 -3
= (4 x 3)3 - 3
= 123 - 3
= 1728 - 3
= 1725
234 - 12 = 222
a, \(5^{x-1}=100:2^2\)\(->5^{x-1}=25\\ ->5^{x-1}=5^2\)\(->x-1=2\\ x=2\)
\(A=\left(6^{2019}-6^{2018}\right):6^{2018}\)
\(=6^{2019}:6^{2018}-6^{2018}:6^{2018}\)
\(=6-1\)
\(=5\)
\(B=234:\left\{3.\left[47-\left(4^2+5\right)\right]\right\}\)
\(=234:\left[3.\left(47-21\right)\right]\)
\(=234:\left(3.26\right)\)
\(=234:78\)
\(=3\)
\(D=2.\left[\left(7-3^3:3^2\right):2^2+99\right]-100\)
\(=2.\left[\left(7-3\right):4+99\right]-100\)
\(=2.\left(1+99\right)-100\)
\(=100.\left(2-1\right)\)
\(=100\)
Ta có: \(3^3.297-97.3^3+5^3\) = \(3^3\left(297-97\right)+5^3\) = \(27.200+125\) = \(5400+125\) = \(5525\)
\(2^3.2^2.5^2.5^3.7\) = \(2^5.5^5.7\) = \(\left(2.5\right)^5.7\) = \(10^5.7\) = \(100000.7\) = \(700000\)
\(2.12.5.5^2.6\) = \(24.5^3.6\) = \(144.5^3\) = \(144.125\) = \(18000\)
\(2^4.221+79.24\) = \(16.221+79.24\) = \(3536+1896\) = \(5432\)
\(234+432+118+216\) = \(234+216+432+118\) = \(450+550\) = \(1000\)
Chúc bạn học tốt!!!
\(\left(x-5\right).4=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-5=0\\4=0\left(ktm\right)\end{cases}\Leftrightarrow\orbr{\begin{cases}x=5\\4=0\left(ktm\right)\end{cases}}}\)
vậy x=5
\(8x-4x=1208\)
\(x\left(8-4\right)=1208\)
\(x4=1208\)
\(\Rightarrow x=1208:4=302\)
\(\left(x-4\right)\left(x-3\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-4=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=4\\x=3\end{cases}}}\)
vậy x=4 hoặc x=3
3ˣ - 3⁴ : 3² = 234
3ˣ - 9 = 234
3ˣ = 234 + 9
3ˣ⁼ = 243
3ˣ = 3⁵
x = 5
\(3^x-3^4:3^2=243\)
\(\Rightarrow3^x-3^{4-2}=234\)
\(\Rightarrow3^x-3^2=234\)
\(\Rightarrow3^x=234+9\)
\(\Rightarrow3^x=243\)
\(\Rightarrow3^x=3^5\)
\(\Rightarrow x=5\)