\(156-\left(x+61\right)=82\)
\(\left(x+61\right)=156-82\)
\(\left(x+61\right)=74\)
\(\Rightarrow x=13\)
PP/ss: Lm từng câu ạ ((:
\(156-\left(x+61\right)=82\)
\(\Rightarrow x+61=156-82\)
\(\Rightarrow x+61=74\)
\(\Rightarrow x=74-61\)
\(\Rightarrow x=13\)
\(4.\left(2017-16x\right)=10^2-2^5\)
\(4.\left(2017-16x\right)=68\)
\(2017-16x=68:4\)
\(2017-16x=17\)
\(\Rightarrow16x=2000\)
\(\Rightarrow x=125\)
\(5.2^{2x}=80\)
\(\Rightarrow2^{2x}=80\div5\)
\(\Rightarrow4^x=16\)
\(\Rightarrow4^x=4^2\)
\(\Rightarrow x=2\)
\(5.2^{2x}=80\)
\(5.2^{2x}=2^4.5\)
\(\Rightarrow2x=4\)
\(\Rightarrow x=2\)
a, 156 - ( x + 61 ) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
b, 4 . ( 2017 - 16x ) = 10\(^2\)- 2\(^5\)
4 . ( 2017 - 16x ) = 100 - 32
4 . ( 2017 - 16x ) = 68
2017 - 16x = 68 : 4
2017 - 16x = 17
16x = 2017 - 17
16x = 2000
x = 2000 : 16
x = 125
c, 5 . 2\(^{2x}\)= 80
2\(^{2x}\)= 80 : 5
2\(^{2x}\)= 16
2\(^{2x}\)= 2\(^4\)
=> 2x = 4
x = 4 : 2
x = 2
