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3x = 32 . 92
3x = 32 . ( 32 )2
3x = 32 . 34
3x = 36
=> x = 6
Vậy x = 6
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1 + 2 + 3 +... + 100 = (100 + 1) x 100 : 2 = 4950
x + 4950 = 5056
x = 5056 - 4950 = 106
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Sửa đề:
\(\left(2x+\frac{3}{5}\right)^2-\frac{9}{25}=0\)
\(\left(2x+\frac{3}{5}\right)^2=\frac{9}{25}\)
\(\left(2x+\frac{3}{5}\right)^2=\left(\pm\frac{3}{5}\right)^2\)
\(\Rightarrow\orbr{\begin{cases}2x+\frac{3}{5}=\frac{3}{5}\\2x+\frac{3}{5}=-\frac{3}{5}\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=0\\2x=-\frac{6}{5}\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=0\\x=-\frac{3}{5}\end{cases}}}\)
Vậy \(x=0\) hoặc \(x=-\frac{3}{5}\)
Tham khảo nhé
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\(3.\left(3x-\frac{1}{2}\right)^3+\frac{1}{9}=0\)
\(3.\left(3x-\frac{1}{2}\right)^3=-\frac{1}{9}\)
\(3x-\frac{1}{2}^3=-\frac{1}{9}:3\)
\(\left(3x-\frac{1}{2}\right)^3=-\frac{1}{9}.\frac{1}{3}\)
\(\left(3x-\frac{1}{2}\right)^3=-\frac{1}{27}\)
\(\left(3x-\frac{1}{2}\right)^3=\left(-\frac{1}{3}\right)^3\)
\(\Rightarrow3x-\frac{1}{2}=-\frac{1}{3}\)
\(3x=-\frac{1}{3}+\frac{1}{2}\)
\(3x=-\frac{2}{6}+\frac{3}{6}\)
\(3x=\frac{1}{6}\)
\(x=\frac{1}{6}:3\)
\(x=\frac{1}{6}.\frac{1}{3}\)
\(x=\frac{1}{18}\)
Vậy \(x=\frac{1}{18}\)
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\(\text{2-[3-[4-6-[7-8-9]-[5-10-11]}\)
\(=2-3-4+6-7+8+9-5+10+11\)
\(=27\)
học tốt
\(9^2\)\(-\)\(9^3\)\(x\)\(2\)
= \(18\)\(-\)\(729\)\(x\)\(2\)
= \(18\)\(-\)\(1458\)
= \(-1440\)
HỊC TỐT!!!
\(9^2-9^3.2=9^2-9^2.9.2=81-81.18=81.\left(1-18\right)=81.\left(-17\right)=-1377\)