5-(3x+20)=209
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(=\frac{2^{12}.3^{10}+2^9.3^9.2^3.3.5}{2^{12}.3^{12}-2^{11}.3^{11}}\)
\(=\frac{2^{12}.3^{10}+2^{12}.3^{10}.5}{2^{12}.3^{12}-2^{11}.3^{11}}\)
\(=\frac{2^{12}.3^{10}.\left(1+5\right)}{2^{11}.3^{11}\left(6-1\right)}\)
\(=\frac{2.6}{3.5}=\frac{4}{5}\)
\(a,6825=6000+800+20+5\)
\(b,33471=30000+3000+400+70+1\)
\(c,75850=70000+5000+800+50\)
\(d,86209=80000+6000+200+9\)
a) 6 825 = 6 000 + 800 + 20 + 5
b) 33 471 = 30 000 + 3 000 + 400 + 70 + 1
c) 75 850 = 70 000 + 5 000 + 800 + 50
d) 86 209 = 80 000 + 6 000 + 200 + 9
câu b )
ta phân phối 2 vô
=> \(\frac{2}{11.13}+\frac{2}{13.15}+\frac{2}{15.17}+\frac{2}{17.19}+\frac{x}{209}=\frac{10}{209}\)
\(\Rightarrow\frac{1}{11}-\frac{1}{13}+\frac{1}{13}-\frac{1}{15}+...+\frac{1}{17}-\frac{1}{19}+\frac{x}{209}=\frac{10}{209}\)
\(\Rightarrow\frac{8}{209}+\frac{x}{209}=\frac{10}{209}\)
\(\Rightarrow\frac{x}{209}=\frac{2}{209}\)
\(\Rightarrow x=2\)
5-(3x+20)=209
3x+20=5-209
3x+20=-204
3x=-204-20
3x=-224
x=-224:3
x=-74,33
5-(3x+20)=209
3x+20=5-209=-204
3x=-204-20=-224
x=-224:3=-224/3