1)
a) \(x^3=-125\)
⇒ \(x^3=\left(-5\right)^3\)
⇒ \(x=-5\)
Vậy \(x=-5.\)
b) \(\left(x+5\right)^3=-64\)
⇒ \(\left(x+5\right)^3=\left(-4\right)^3\)
⇒ \(x+5=-4\)
⇒ \(x=\left(-4\right)-5\)
⇒ \(x=-9\)
Vậy \(x=-9.\)
Chúc bạn học tốt!
1) a) \(x^3=-125\)
\(\Rightarrow x=-5\)
b) \(\left(x+5\right)^3=-64\)
\(\rightarrow x+5=-4\)
\(\Rightarrow x=-9\)
2) \(M=\frac{8^{10}+4^{10}}{8^4+4^{12}}=\frac{4^{10}\left(2^{10}+1\right)}{4^4\left(16+4^8\right)}=\frac{1074790400}{16781312}=64,05\)
1)
a)\(x^3=-125\\ x^3=\left(-5\right)^3\\ x=-5\)
vậy x = - 5
b)\(\left(x+5\right)^3=-64\\ \left(x+5\right)^3=\left(-4\right)^3\\ x+5=-4\\ x=-4-5\\ x=-9\)
vậy x = -9
2)\(M=\frac{8^{10}+4^{10}}{8^4+4^{12}}\\ M=\frac{\left(2^3\right)^{10}+\left(2^2\right)^{10}}{\left(2^3\right)^4+\left(2^2\right)^{12}}\\ M=\frac{2^3.2^{10}+2^2.2^{10}}{2^3.2^4+2^2.2^{12}}\\ M=\frac{2^{10}.2^{10}}{2^4.2^{12}}=\frac{4^{10}}{2^{16}}\\ M=16\)
#tick&theo dõi