tính nhanh: 7.5+9[(-3)-(-27)]
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)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (-25) .68 + (-34).(-250)
= -1700 + 8500
= 6800
b, 7.5 + 9 . [(-3) - (-27)]
= 16.5 . 24
= 396
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3^6.45^4-15^{13}.5^{-9}}{27^4.25^3+45^6}\)=\(\frac{3^6.3^8.5^4-5^{13}.3^{13}.5^{-9}}{3^{12}.5^6+3^{12}.5^6}\)=\(\frac{3^{14}.5^4-5^4.3^{13}}{3^{12}.5^6+3^{12}.5^6}\)=\(\frac{3.1.}{1.5^2.}\)=\(\frac{3}{25}\)
Học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,=\dfrac{3^6\cdot5^4\cdot9^4-5^{13}\cdot3^{13}\cdot5^{-9}}{3^{12}\cdot5^6+9^6\cdot5^6}=\dfrac{3^{14}\cdot5^4-5^4\cdot3^{13}}{3^{12}\cdot5^6+3^{12}\cdot5^6}\\ =\dfrac{3^{13}\cdot5^4\cdot2}{2\cdot3^{12}\cdot5^6}=\dfrac{3}{5^2}=\dfrac{3}{25}\)
\(b,=\dfrac{\left(\dfrac{2}{5}\cdot5\right)^7+\left(\dfrac{9}{4}\cdot\dfrac{16}{3}\right)^3}{2^7\cdot5^2+2^9}=\dfrac{2^7+12^3}{2^7\left(5^2+2^2\right)}=\dfrac{2^7+4^3\cdot3^3}{2^7\cdot29}=\dfrac{2^6\left(2+3^3\right)}{2^7\cdot29}=\dfrac{1}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -175 - ( -7 . 5^2 + 4 . 2^3)
= -175 - ( -175 + 32 )
= -175 - -175 +32
= 0 +32
= 32
b) (-27) + 20 + (-9) + 27 + (-11)
= (-27 + 27 ) + 20 + (-11) + (- 9)
= 0 + 9 + (-9)
= 0 + 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\)\(\frac{6}{7}+\frac{1}{7}\times\frac{2}{7}+\frac{1}{7}\times\frac{5}{7}=\frac{6}{7}+\frac{1}{7}\left(\frac{2}{7}+\frac{5}{7}\right)\)
\(=\frac{6}{7}+\frac{1}{7}\times1\)
\(=\frac{6}{7}+\frac{1}{7}\)
\(=1\)
Cách 1: \(B=\frac{4}{9}\times\frac{13}{3}-\frac{4}{3}\times\frac{40}{9}\)
\(=\frac{52}{27}-\frac{160}{27}\)
\(=-4\)
K cho mk nhé thks bn nhiều
~CHÚC BẠN HỌC TỐT~
7.5 + 9 . [(-3) - (-27)]
= 16.5 . 24
= 396
7.5+9[(-3)-(-27)]
= 7.5+9.24
= 35+216
= 251.