rút gọn biểu thức : $\frac{7^{48}*5^{30}*2^{8} – 5^{30} * 7^{49}* 2^{10} }{5^{29}*2^{8}*7^{48}}$

$\frac{7^{48}.5^{30}.2^8-5^{30}.7^{49}.2^{10}}{5^{29}.2^8.7^{48}}=$ $\frac{7^{48}.5^{30}.2^8(1-7.2^2)}{5^{29}.2^8.7^{48}}=$$5.(1-7.4)=5.(-27)=-135$