Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a: \(S=\left(1+3\right)+3^2\left(1+3\right)+3^4\left(1+3\right)+...+3^8\left(1+3\right)\)
\(=4\left(1+3^2+3^4+...+3^8\right)⋮4\)
b: \(S=\left(1+2\right)+2^2\left(1+2\right)+...+2^8\left(1+2\right)\)
\(=3\left(1+2^2+...+2^8\right)⋮3\)
a ) \(A=2^0+2^1+2^2+...+2^{2010}\)
\(\Rightarrow2A=2+2^2+2^3+...+2^{2011}\)
\(\Rightarrow2A-A=\left(2+...+2^{2011}\right)-\left(2^0+2^1+...+2^{2010}\right)\)
\(\Rightarrow2A-A=2^{2011}-2^0\)
\(\Rightarrow A=2^{2011}-1\)
b ) \(B=1+3+3^2+...+3^{100}\)
\(\Rightarrow3B=3+3^2+3^3+...+3^{101}\)
\(\Rightarrow3B-B=\left(3+3^2...+3^{2011}\right)-\left(1+3+...+3^{2010}\right)\)
\(\Rightarrow2B=3^{2011}-1\)
\(\Rightarrow B=\frac{3^{2011}-1}{2}\)
Chúc bạn học tốt !!!
a, \(3^4\div3^2-\left[120-\left(2^6.2+5^2.2\right)\right]\)
\(=3^2-\left\{120-\text{[}2.\left(2^6+5^2\right)\text{]}\right\}\)
\(=3^2-\left(120-2\cdot89\right)\)
\(=9--58=9+58=67\)
1. \(a,3^4:3^2-\left[120-(2^6\cdot2+5^2\cdot2)\right]\)
\(=3^2-\left[120-\left\{(2^6+5^2)\cdot2\right\}\right]\)
\(=3^2-\left[120-\left\{(64+25)\cdot2\right\}\right]\)
\(=9-\left[120-89\cdot2\right]\)
\(=9-\left[120-178\right]=9-(-58)=67\)
b, Tương tự như bài a
2.a,\(4^x\cdot5+4^2\cdot2=2^3\cdot7+56\)
\(\Leftrightarrow4^x\cdot5+16\cdot2=8\cdot7+56\)
\(\Leftrightarrow4^x\cdot5+32=56+56\)
\(\Leftrightarrow4^x\cdot5+32=112\)
\(\Leftrightarrow4^x\cdot5=80\)
\(\Leftrightarrow4^x=16\Leftrightarrow4^x=4^2\Leftrightarrow x=2\)
\(b,24:(2x-1)^3-2=1\)
\(\Leftrightarrow24:(2x-1)^3=3\)
\(\Leftrightarrow(2x-1)^3=8\)
\(\Leftrightarrow(2x-1)^3=2^3\)
\(\Leftrightarrow2x-1=2\)
Làm nốt là xong thôi
Bài 1 tự làm!
Bài 2:
a, \(\left(3x-4\right)\left(x-1\right)^3=0\Rightarrow\left[{}\begin{matrix}3x-4=0\\\left(x-1\right)^3=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{3}\\x-1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{3}\\x=1\end{matrix}\right.\)
b, \(2^{2x-1}:4=8^3\Rightarrow2^{2x-1}:2^2=2^9\)
\(\Rightarrow2x-1-2=9\Rightarrow2x-3=9\Rightarrow2x-12\Rightarrow x=6\)
c, Đề chưa rõ
d, \(\left(x+2\right)^5=2^{10}\Rightarrow\left(x+2\right)^5=4^5\Rightarrow x+2=4\Rightarrow x=2\)
e, \(\left(3x-2^4\right).7^3=2.7^4\Rightarrow3x-2^4=2.7^4:7^3\Rightarrow3x-16=2.7=14\)
\(\Rightarrow3x=14+16=30\Rightarrow x=\dfrac{30}{3}=10\)
f, \(\left(x+1\right)^2=\left(x+1\right)^0\Rightarrow\left(x+1\right)^2=1\) (vì x0 = 1)
\(\Rightarrow x+1=1\Rightarrow x=0\)
a/ 390 - \(2^6\) = 390 - 64 = 326
b/ 786 : ( \(3^2.2^3-7.10\) ) = 786 : ( 9 . 8 - 70 ) = 786 : (72 - 70) = 786 : 2 = 393
c/ 426 - ( \(5^2.3^2+4^3.3^5\)) = 426 - ( 25 - 9 + 64 . 243 ) = 426 - ( 25 - 9 + 15552 ) = 426 - 15568 = - 15142
d/ \(4^3-3^3=64-27=37\)
e/ \(5^2-4^2=25-16=9\)
Chúc bạn học tốt!!!
Mình chỉ ghj đáp za thôj nên thông cảm nha
b)1953368
c)225
d)32
\(a,=4^{10}.4^{10}.4^{45}\)
\(=4^{65}\)
\(b,=5^9+3^5\)
\(=1953125+243\)
\(=1953368\)
\(c,=1+8+27+64+125\)
\(=225\)
\(d,=32^5:32^4\)
\(=32\)
B=20+31+33+24.22.23
B=20+31+33+29
B=1+3+27+512
B=4+27+512
B=31+512
B=543
Vậy B=543