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a ) \(\left(3\times x-15\right)^7=0.\)
\(3\times x-15=0\)
\(3\times x=15\)
\(x=5\)
b ) \(10-\left\{\left[\left(x\div3+17\right)\div10+3\times2^4\right]\div10\right\}=5\)
\(10-\left\{\left[\left(x\div3+17\right)\div10+3\times16\right]\div10\right\}=5\)
\(10-\left\{\left[\left(x\div3+17\right)\div10+48\right]\div10\right\}=5\)
\(\left[\left(x\div3+17\right)\div10+48\right]\div10=10-5\)
\(\left[\left(x\div3+17\right)\div10+48\right]\div10=5\)
\(\left(x\div3+17\right)\div10+48=50\)
\(\left(x\div3+17\right)\div10=2\)
\(x\div3+17=20\)
\(x\div3=3\)
\(x=9\)
=> 5x + 80 = 315 - 155
=> 5x + 80 = 160
=> 5x = 160 - 80
=> 5x = 80
=> x = 80 : 5
=> x = 16
= ( 5x + 80 ) = 315 - 155
= ( 5x + 80 ) = 160
= 5x =160 - 80
= 5x = 80
= x = 80 : 5
= x 16
(1+7/9).(1+7/20).(1+7/33).(1+7/48)......(1+7/180)
=16/9.27/20.40/33.55/48........187/180
=2.8/1.9 . 3.9/2.10 . 4.10/3.11 . 5.11/4.12 ........ 11.17/18.10
=(2.3.4.5.......11).(8.9.10......17)/(1.2.3.4.....18).(9.10.11.12......18)
=11.8/1.18=88/18=44/9
\(a,\left(x+\frac{5}{3}\right).\left(x-\frac{5}{4}\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x+\frac{5}{3}=0\\x-\frac{5}{4}=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{-5}{3}\\x=\frac{5}{4}\end{cases}}\)
Vậy \(x=\frac{-5}{3}\)hoặc \(x=\frac{5}{4}\).
Học tốt
\(\left(x+\frac{5}{3}\right)\left(x-\frac{5}{4}\right)=0\)
<=> x + 5/3 = 0 hoặc x - 5/4 = 0
<=> x = - 5/3 hoặc x = 5/4
\(315-\left(5\times x+80\right)=155\)
\(\left(5\times x+80\right)=315-155\)
\(5\times x+80=160\)
\(5\times x=80\)
\(x=16\)