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\(\frac{254^5+254^6}{254^3.254^2}=\frac{254^3.254^2+254^6}{254^3.254^2}=254^6\)
\(\frac{254^5+254^6}{254^3\cdot254^2}=\frac{254^5\left(1+254\right)}{254^5}=1+254=255\)
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5 + 97 - x + (72 . 45)= 254 + x - 27
5 + 97 - x + 3240= 254 + x - 27
- x -x = - 3240 +254 - 27 - 97 - 5
-2x = -3115
x=1557,5
\(5+97-x+\left(72.45\right)=254+x-27\)
\(5+97-x+3240=254+x-27\)
\(-x-x=254-27-5-97-3240\)
\(-2x=-3115\)
\(x=-3115:-2\)
\(x=\dfrac{3115}{2}=1557,5\)
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-314 - 3.(5 + x) = -254
3.(5 + x) = -314 + 254
3.(5 + x) = -60
5 + x = -60 : 3
5 + x = -20
x = -20 - 5
x = -25
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2.(x+5)+126=x+1000-254
2.x+10+126=x+746
x+x+136=x+746
=>x+136=746
x=746-136
x=610
chúc bạn học tốt nha
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(x+1) + (x+3) + ... + (x+99) = 5100
(x+x+..+x) + (1+3+...+99) = 5100
xét dãy số 1;3;...;99 có:
(99-1) : 2 + 1 = 50 (số)
có: (x.50) + (99+1) . 50 : 2 = 5100
(x.50) + 100 .50 : 2 = 5100
(x.50) + 5000 : 2 = 5100
(x.50) + 2500 = 5100
x.50 = 5100 - 2500
x.50 = 2600
x = 2600 : 50
x = 52
vậy......
x - 254 = 5100 : 598
x - 254 = 25
x = 25 + 254
x = 279
x - 254 = 5100 : 598
x - 254 = 52
x - 254 = 25
x = 25 + 254
x = 279