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2) (x - 2)10 - (x - 2)8 = 0
(x - 2)2[(x - 2)2 - 1] = 0
x - 2 = 0 hoac (x - 2)2 - 1 = 0
x = 0 + 2 (x - 2)2 = 0 + 1
x = 2 (x - 2)2 = 1
x = 3
Vay: x = 2 hoac x = 3
Cau 2 bai 2 lam tuong tu
a) \(125^7:25^4=\left(5^3\right)^7:\left(5^2\right)^4=5^{21}:5^8=5^{13}\)
b) \(27^8:9^5=\left(3^3\right)^8:\left(3^2\right)^5=3^{24}:3^{10}=3^{14}\)
c) \(4^{20}:2^{30}=\left(2^2\right)^{20}:2^{30}=2^{40}:2^{30}=2^{10}\)
d) \(28^n:2^n=28^n:4^n=7^n\)
e) \(64^5.16^6:4^{20}=2^{30}.2^{24}:2^{10}=2^{54}:2^{40}=2^{14}\)
f) \(32^4:8^6=2^{20}:2^{18}=2^2\)
\(a.125^7:25^4=5^{21}:5^8=5^{13}\)
\(b.27^8:9^5=3^{24}:3^{10}=3^{14}\)
\(c.4^{20}:2^{30}=2^{40}:2^{30}=2^{10}\)
\(d.28^n:2^{2n}=28^n:4^n=7n\)
\(\hept{\begin{cases}e.64^5.16^6:4^{20}=4^{15}.4^{12}:4^{20}=4^7\\f.32^4:8^6=2^{20}:2^{18}=2^2\end{cases}}\)
2^8 . 4^5 . 9^9
=2^8 . (2^2)^5 . (3^2)^9
=2^8 . 2^10 . 3^18
=2^18 . 3^18
=(3.2)^18
=6^18
\(2^8.4^5.9^9=2^8.\left(2^2\right)^5.\left(3^2\right)^9\)\(=2^8.2^{10}.3^{18}\)\(=2^{18}.3^{18}\)
M=8/3.2/5.3/8.10.19/92
=(8/3.3/8).(2/5.10).19/92
=1.4.19/2
=4.19/92
=19/23
N=5/7.5/11+5/7.2/11-5/7.14/11
=5/7.(5/11+2/11-14/11)
=5/7. -7/11= -5/11
Q=(1/99+12/999 +123/9999).(1/2-1/3-1/6)
=(1/99+12/999+123/9999).(3/6+ -2/6+ -1/6)
=(1/99+12/999+123/9999). 0
=0
a) \(x+\left(-81\right)-\left(11-81\right)=x-81-11+81=x-11\)
b) \(\left(-1-x+2\right)+1=\left(-1\right)-x+2+1=-x+2=2-x\)
c) \(15-\left(11-x\right)+\left(11-15\right)=15-11-x+11-15\)
\(=\left(15-15\right)+\left(11-11\right)+x=0+0+x=x\)
d) \(15-\left(15-x+202\right)=15-15+x-202=x-202\)
a)x-81-11+81=x-11
b)(-1-x+2)+1=-1-x+2+1=2-x
c)15-(11-x)+(11-15)=15-11+x+11-15=x
d)15-(15-x+202)+202=15-15+x-202+202=x
a) A=8^2.32^4=(2^3)^2.(2^5)^4=2^6.2^20=2^26
b)B=27^3.9^4.243=(3^3)^3.(3^2)^4.3^5=3^9.3^8.3^5=3^22
HOK TỐT
a) A = 82 . 324 = (23)2 . ( 25)4 = 26 . 220 = 226
vậy A = 226
b) B = 273 . 94 . 243 = (33)3 . (32)4 . 35= 39 . 38 . 35 = 322
vậy B = 322
chúc bạn hok tốt
dễ mà
1)=56
2)=75
3)=33
4)x=3
các bạn cho mk vài li-ke cho tròn 800 với
Đáp án cần chọn là: A
Ta có 11.11.11.11= 11 4