219.273+15.49*94/69*210+1210
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Lời giải:
\(P=\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\\ =\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^9.3^9.2^{10}+2^{20}.3^{10}}\\ =\frac{2^{19}.3^9+2^{18}.3^9.5}{2^{19}.3^9+2^{20}.3^{10}}\\ =\frac{2^{18}.3^9(2+5)}{2^{19}3^9(1+2.3)}\\ =\frac{1}{2}\)
b: \(\dfrac{4^5\cdot9^4-2\cdot6^9}{2^{10}\cdot3^8+6^8\cdot20}\)
\(=\dfrac{2^{10}\cdot3^8-2^{10}\cdot3^9}{2^{10}\cdot3^8+3^8\cdot2^{10}\cdot5}\)
\(=\dfrac{2^{10}\cdot3^8\left(1-3\right)}{2^{11}\cdot3^9}\)
\(=\dfrac{1}{2}\cdot\dfrac{-2}{3}=\dfrac{-1}{3}\)
a: \(A=2^{100}-2^{99}+2^{98}-2^{97}+...+2^2-2\)
=>\(2A=2^{101}-2^{100}+2^{99}-2^{98}+...+2^3-2^2\)
=>\(2A+A=2^{101}-2^{100}+2^{99}-2^{98}+...+2^3-2^2+2^{100}-2^{99}+...+2^2-2\)
=>\(3A=2^{101}-2\)
=>\(A=\dfrac{2^{101}-2}{3}\)
b: Sửa đề: \(A=\dfrac{2\cdot8^4\cdot27^2+4\cdot6^9}{2^7\cdot6^7+2^7\cdot40\cdot9^4}\)
\(A=\dfrac{2\cdot2^{12}\cdot3^6+2^2\cdot2^9\cdot3^9}{2^7\cdot2^7\cdot3^7+2^7\cdot2^3\cdot5\cdot3^8}\)
\(=\dfrac{2^{11}\cdot3^6\left(2^3+3^3\right)}{2^{10}\cdot3^7\left(2^4+5\cdot3\right)}\)
\(=\dfrac{2}{3}\cdot\dfrac{4+27}{16+15}=\dfrac{2}{3}\)
c: \(B=\dfrac{4^5\cdot9^4-2\cdot6^4}{2^{10}\cdot3^8+6^8\cdot20}\)
\(=\dfrac{2^{10}\cdot3^8-2\cdot2^4\cdot3^4}{2^{10}\cdot3^8+2^8\cdot2^2\cdot5\cdot3^8}\)
\(=\dfrac{2^5\cdot3^4\left(2^5\cdot3^4-1\right)}{2^{10}\cdot3^8\left(1+5\right)}=\dfrac{1}{2^5\cdot3^4}\cdot\dfrac{32\cdot81-1}{6}\)
\(=\dfrac{2591}{2^6\cdot3^5}\)
\(\dfrac{49\cdot2+49\cdot3}{15\cdot49}=\dfrac{2+3}{15}=\dfrac{5}{15}=\dfrac{1}{3}\)
\(-69+53+46+\left(-94\right)+\left(-14\right)+78\\ =-69+53+46-94-14+78\\ =-69+99-108+78\\ =30-30\\ =0.\)
−69+53+46+(−94)+(−14)+78
=−69+53+46−94−14+78
=(78−94+46)+(53−69−14)
=30+(−30)
=0
-69 + 53 + 46 + (-94) + (-14) + 78
= [(-69) + (-94) + (-14)] + (53 + 46 + 78)
= [(-163) + (-14)] + (53 + 46 + 78)
= (-177) + (99 + 78)
= (-177) + 177
= 0
-69+53+46+(-94)+(-14)+78
=(-94+53)+(-14+46)+(-69)+78
=-41+32+(-69)+78
=(-41+(-69)) + (32+78)
=-110+110
=0
- 69 + 53 + 46 + ( - 94 ) + ( - 14 ) + 78
= - 16 + 46 + ( - 94 ) + ( - 14 ) + 78
= 30 + ( - 94 ) + ( - 14 ) + 78
= - 64 + ( - 14 ) + 78
= - 78 + 78
= 0
Vậy kết quả của phép tính trên bằng 0
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}.12^{10}}\)
\(=\frac{4^9.2.9^3.3^3+3.5.4^9.9^3.3^2}{6^9.2^{10}.2^{10}.6^{10}}\)
\(=\frac{4^9.9^3.3^2.6+4^9.9^3.3^2.15}{6^{19}.2^{20}}\)
\(=\frac{4^9.9^3.3^2.31}{2^{39}.3^{19}}\)
\(=\frac{4^9.3^6.31}{4^{19}.2.3^{17}}\)
\(=\frac{31}{4^{10}.3^{11}.2}\)