Ta có: \(\frac{-2^{10}\cdot3^{10}\cdot6^9}{4^3\cdot\left(-16\right)^{19}}\)

\(=\frac{-2^{10}\cdot3^{10}\cdot2^9\cdot3^9}{2^6\cdot\left(-1\right)\cdot16^{19}}=\frac{2^{19}\cdot3^{19}}{2^6\cdot\left(2^4\right)^{19}}\)

\(=\frac{2^{13}\cdot3^{19}}{2^{76}}=\frac{3^{19}}{2^{63}}\)

xin lỗi các bạn mình ko bết viết phân số nên viết thế này mọi người thông cảm và giải hộ mình nhé! CẢM ƠN MỌI NGƯỜI

\(\frac{4^5.9^4-10.6^9}{2^{10}.3^8+6^8.28}\)

\(=\frac{\left(2^2\right)^5.\left(3^2\right)^4-2.5.\left(2.3\right)^9}{2^{10}.3^8+\left(2.3\right)^8.2^2.7}\)

\(=\frac{2^{10}.3^8-2^{10}.3^9.5}{2^{10}.3^8+2^{10}.3^8.7}\)

\(=\frac{2^{10}.3^8\left(1-3.5\right)}{2^{10}.3^8\left(1+7\right)}=\frac{-14}{8}=-\frac{7}{4}\)

Vậy : \(\frac{4^5.9^4-10.6^9}{2^{10}.3^8+6^8.28}=-\frac{7}{4}\)

Ta có: \(5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9\)

\(=5\cdot2^{30}\cdot3^{18}-2^2\cdot3^{20}\cdot2^{27}\)

\(=5\cdot2^{30}\cdot3^{18}-2^{29}\cdot3^{20}\)

\(=2^{29}\cdot3^{18}\left(5\cdot2-3^2\right)=2^{29}\cdot3^{18}\)

Ta có: \(5\cdot2^{10}\cdot6^{19}-7\cdot2^{29}\cdot27^6\)

\(=5\cdot2^{10}\cdot2^{19}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}\)

\(=5\cdot2^{29}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}\)

\(=2^{29}\cdot3^{18}\left(5\cdot3-7\right)=2^{32}\cdot3^{18}\)

Ta có: \(\frac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^{10}\cdot6^{19}-7\cdot2^{29}\cdot27^6}\)

\(=\frac{2^{29}\cdot3^{18}}{2^{32}\cdot3^{18}}=\frac{1}{2^3}=\frac18\)

Trả lời:

\(10+11+12+13+14+15+16+17+18+19+20\)

\(=\left(10+20\right)+\left(11+19\right)+\left(12+18\right)+\left(13+17\right)+\left(14+16\right)+15\)

\(=30+30+30+30+30+15\)

\(=165\)

\(1+2+3+4+5+6+7+8+9\)

\(=\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5\)

\(=10+10+10+10+5\)

\(=45\)

10+11+12+13+14+15+16+17+18+19+20

(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15

30+30+30+30+30+15

165

tính máy tính là ra mà bn

a) (19.x + 2.5²): 14 = 9

    19.x +2.5²           = 9.14 =126

     19.x+ 50             =126

            19.x            =126-50 =76

                  x           = 76 :19 = 4

Câu b sao ko có đáp án tìm x vậy bn