Trả lời
a)2240:[(x-112).2 mũ 3]=5
(x-121)23 =2240:5
(x-121)8 =448
x-121 =448:8
x-121 =56
x =56+121
x =177.
Em có tk cj cx ko được lên điểm đâu, cj lm cho vui thôi !
Tiếp nek !
b)2808:(x.122:23)=192:25
2808:(x.144:8) =192:32
2808:(x.18) =6
x.18 =2808:6
x18 =468
x =468:18
x =26.
c)[262-(5x.3+92)]:5=104
676-(5x.3+92) =104.5
676-(5x.3+92) =520
5x.3+92 =676-520
5x.3+81 =156
5x.3 =156-81
5x.3 =75
5x =75:3
5x =25
5x =52
=>x =2.
\(a,2240:\left[\left(x-11^2\right).2^3\right]=5\)
\(\Rightarrow\left(x-11^2\right).2^3=448\)
\(\Rightarrow\left(x-121\right).8=448\)
\(\Rightarrow x-121=56\)
\(\Rightarrow x=177\)
\(b,2808:\left(x.12^2:2^3\right)=192:2^5\)
\(\Rightarrow2808:\left(x.144:8\right)=192:32\)
\(\Rightarrow2808:\left(x.18\right)=6\)
\(\Rightarrow x.18=468\)
\(\Rightarrow x=26\)
\(c,\left[26^2-\left(5^x.3+9^2\right)\right]:5=104\)
\(\Rightarrow\left[676-\left(5^x.3+81\right)\right]:5=104\)
\(\Rightarrow676-\left(5^x.3+81\right)=520\)
\(\Rightarrow5^x.3+81=156\)
\(\Rightarrow5^x.3=75\)
\(\Rightarrow5^x=25\)
\(\Rightarrow5^x=5^2\)
\(\Rightarrow x=2\)
\(d,\left[2^{10}-\left(171-x\right).12\right]:2=56\)
\(\Rightarrow\left[1024-\left(171-x\right).12\right]:2=56\)
\(\Rightarrow1024-\left(171-x\right).12=112\)
\(\Rightarrow\left(171-x\right).12=912\)
\(\Rightarrow171-x=76\)
\(\Rightarrow x=95\)
