tính nhanh :2.4*25+102*9.4-9.4-9.4
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\dfrac{-7}{9}\cdot\dfrac{4}{11}+\dfrac{-7}{9}\cdot\dfrac{7}{11}+5\dfrac{7}{9}\)
\(=-\dfrac{7}{9}\left(\dfrac{4}{11}+\dfrac{7}{11}\right)+5+\dfrac{7}{9}\)
\(=-\dfrac{7}{9}+5+\dfrac{7}{9}\)
=5
![](https://rs.olm.vn/images/avt/0.png?1311)
y:9.4=53.5-17
y:9.4=248
y:9 =248:4
y:9 =62
y =62.9
y =558
thử lại:558:9.4=53.5-17
62.4 =265-17
248=248
k mình nha^_^
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2^{10}.3^8-2^8.3^9.4}{2^{10}.3^6.9+2^{10}.3^9}=\frac{2^{10}.\left(3^8-3^9\right)}{2^{10}\left(3^9-3^9\right)}=\frac{3^8-3^9}{3^9-3^9}=\frac{3^8\left(1-3\right)}{3^9\left(1-1\right)}=\frac{3^8.\left(-2\right)}{3^9.0}=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
C1:9.4 - 2.5 - 4.7 C2:9.4 - 2.5 - 4.7
=36 - 10 - 28 =9.4 - 4.7 - 2.5
=-2 =4.(9 - 7) - 2.5
=4.2 - 2.5
=2.(4 - 5)
=2.(-1)
=-2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{5\cdot6^{18}\cdot2^{12}-2\cdot2^{28}\cdot3^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{5\cdot2^{30}\cdot3^{18}-2^{29}\cdot3^{18}}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{3^{18}\cdot2^{29}\left(5\cdot2-1\right)}{2^{28}\cdot3^{18}\left(5-7\cdot2\right)}=\dfrac{2\cdot9}{-9}=-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{9}{12}=\dfrac{3}{4};\dfrac{4}{12}=\dfrac{3}{9};\dfrac{4}{3}=\dfrac{12}{9};\dfrac{9}{3}=\dfrac{12}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
kết quả là 1016.55
ngớ tick cho mình nha