Bài 1:Thực hiện phép tính.
1) dfrac{2cdot6^9-2^5cdot18^4}{2^2cdot6^8} ; 2)dfrac{15^3+5cdot15^2-5^3}{18^2+6cdot18^2-6^3}
Bài 2:Tìm x, biết:
1)^{left(5x+1right)^2}dfrac{36}{49} ; 2) 2^{x-1}16 ; 3)left(-dfrac{3}{4}right)^{3x-1}-dfrac{27}{64} ; 4)dfrac{-1}{2}+dfrac{5}{x+3}dfrac{-5}{6}
5)dfrac{37-x}{x+13}dfrac{3}{7} ; 6)dfrac{1}{12}:dfrac{4}{21}3dfrac{1}{2}:left(3x-2right) ; 7) ^{2^{2x+1}+4^{x+3}264} ; 8) dfrac{x+7}{-20}dfrac{-5}{x+7}
9) dfrac{...
Đọc tiếp
Bài 1:Thực hiện phép tính.
1) \(\dfrac{2\cdot6^9-2^5\cdot18^4}{2^2\cdot6^8}\) ; 2)\(\dfrac{15^3+5\cdot15^2-5^3}{18^2+6\cdot18^2-6^3}\)
Bài 2:Tìm x, biết:
1)\(^{\left(5x+1\right)^2}\)=\(\dfrac{36}{49}\) ; 2) \(2^{x-1}=16\) ; 3)\(\left(-\dfrac{3}{4}\right)^{3x-1}=-\dfrac{27}{64}\) ; 4)\(\dfrac{-1}{2}+\dfrac{5}{x+3}=\dfrac{-5}{6}\)
5)\(\dfrac{37-x}{x+13}=\dfrac{3}{7}\) ; 6)\(\dfrac{1}{12}:\dfrac{4}{21}=3\dfrac{1}{2}:\left(3x-2\right)\) ; 7) \(^{2^{2x+1}+4^{x+3}=264}\) ; 8) \(\dfrac{x+7}{-20}=\dfrac{-5}{x+7}\)
9) \(\dfrac{x}{8}=\dfrac{x}{x^3}\) ; 10) \(\dfrac{x-1}{x+5}=\dfrac{6}{7}\)
Mọi người giúp mình với,làm ơn !!!!!
