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Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3
\(\text{a) ( x + 1 ) + ( x + 3 ) + ..... + ( x + 99 ) = 0}\)
\(\Rightarrow\left(x+x+x+.....+x\right)+\left(1+3+5+....+99\right)=0\)
\(\text{Ta có :}\)
\(1+3+5+...+99=\frac{\left(99-1\right):2+1.\left(99+1\right)}{2}=2500\)
\(\Rightarrow50x+2500=0\)
\(\Rightarrow50x=-2500\)
\(\Rightarrow x=-50\)
b1 :tìm nEN biết
3 mũ 4 nhân 3 mũ 4 = 3mũ 5
b2) Tìm xEN biết
9< 3 mũ <27
B3:SO SÁNH
10 mũ 20 và 90 mũ 10
Bài 3:
Ta có: \(10^{20}=10^{2.10}=\left(10^2\right)^{10}=100^{10}\)
Vì \(90< 100\)\(\Rightarrow90^{10}< 100^{10}\)
hay \(10^{20}>90^{10}\)
=>3025=(x+1)^2 NHỚ K ĐÓ nha bạn
=>x+1=55 hoặc x+1=-55
=>x=54 hoăc x=-56
(x+3)^2 + (x-15)^2 = 0
co (x + 3^2) > 0 va (x-15)^2 > 0
=> (x+3)^2 = 0 va (x - 15)^2 = 0
=> x + 3 = 0 va x - 15 = 0
=> x = -3 va x = 15
vay x thuoc tap hop rong :v
Bạn phuong uyen không phải và đâu mà là hoặc đấy chỉ cần 1 trong hai cái =0
\(\left(x-3\right)^3=\left(x-3\right)^2\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x-3=1\end{cases}}\Rightarrow\orbr{\begin{cases}x=0+3\\x=1+3\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=4\end{cases}}\)
chắc ko bạn