tớ Đố bạn câu này 97,5-865=?????

= 1089 nha

( 27 - 11 )  +  ( 20 - 9 - 27 )

= 27 - 11 + 20 - 9 - 27

= (27 - 27) + 20 - (11 + 9)

= 20 - 20 = 0

đáp số =0

= (27 - 11) +(20+9-27)

= (27 - 27) + (11+9) +20

= 0              +  20     + 20

= 0+40

=40

7.5 + 9 . [(-3) - (-27)]

= 16.5 . 24

= 396

7.5+9[(-3)-(-27)]

= 7.5+9.24

= 35+216

= 251.

=[(-27)+27]+[20+(-9)+(-11)] = 0+ 0=0

=0 nha Tran Thi Xuan

địt mẹ mày

\(a,=\dfrac{3^6\cdot5^4\cdot9^4-5^{13}\cdot3^{13}\cdot5^{-9}}{3^{12}\cdot5^6+9^6\cdot5^6}=\dfrac{3^{14}\cdot5^4-5^4\cdot3^{13}}{3^{12}\cdot5^6+3^{12}\cdot5^6}\\ =\dfrac{3^{13}\cdot5^4\cdot2}{2\cdot3^{12}\cdot5^6}=\dfrac{3}{5^2}=\dfrac{3}{25}\)

\(b,=\dfrac{\left(\dfrac{2}{5}\cdot5\right)^7+\left(\dfrac{9}{4}\cdot\dfrac{16}{3}\right)^3}{2^7\cdot5^2+2^9}=\dfrac{2^7+12^3}{2^7\left(5^2+2^2\right)}=\dfrac{2^7+4^3\cdot3^3}{2^7\cdot29}=\dfrac{2^6\left(2+3^3\right)}{2^7\cdot29}=\dfrac{1}{2}\)

a) \(\dfrac{3^6\cdot3^8\cdot5^4-5^{13}\cdot3^{13}\cdot5^{-9}}{3^{12}\cdot5^6+3^{12}\cdot5^6}=\dfrac{3^{14}\cdot5^4-3^{13}\cdot5^4}{3^{12}\cdot5^6\cdot2}=\dfrac{3^{12}\cdot5^4\left(3^2-3\right)}{3^{12}\cdot5^6\cdot2}=\dfrac{3^2-3}{5^2\cdot2}=\dfrac{6}{50}=\dfrac{3}{25}\)

\(\frac{9^3\cdot2^{10}\cdot27^5}{4^5\cdot81^6}=\frac{3^6\cdot2^{10}\cdot3^{15}}{2^{10}\cdot3^{24}}=\frac{1}{3^3}=\frac{1}{27}\)

\(\frac{27^4\cdot2^5-3^{11}\cdot4^3}{8^2\cdot9^6}=\frac{3^{12}\cdot2^5}{2^6\cdot3^{12}}-\frac{3^{11}\cdot2^6}{2^6\cdot3^{12}}=\frac{1}{2}-\frac{1}{3}=\frac{1}{6}\)

=))

a) \(\frac{9^3.2^{10}.27^5}{4^5.81^6}\)= \(\frac{\left(3^2\right)^3.2^{10}.\left(3^3\right)^5}{\left(2^2\right)^5.\left(3^4\right)^5}\)= \(\frac{3^{2.3}.2^{10}.3^{3.5}}{2^{2.5}.3^{4.5}}\)= \(\frac{3^6.2^{10}.3^{15}}{2^{10}.3^{20}}\)= \(\frac{3^{21}.2^{10}}{2^{10}.3^{20}}\)= \(\frac{3^{20}.2^{10}.3}{2^{10}.3^{20}}\)= \(3\)

\(a,\frac{9^3\cdot2^{10}\cdot27^5}{4^5\cdot81^6}\)

\(=\frac{\left[3^2\right]^3\cdot\left[2^2\right]^5\cdot\left[3^3\right]^5}{\left[2^2\right]^5\cdot\left[3^4\right]^6}\)

\(=\frac{3^6\cdot2^{10}\cdot3^{15}}{2^{10}\cdot3^{24}}=\frac{3^6\cdot3^{15}}{3^{24}}=\frac{3^{21}}{3^{24}}=3^{21-24}=3^{-3}=\frac{1}{27}\)

b, Như bạnThảo Nguyễn 緑

Sai môn rồi

a, (-25) .68 + (-34).(-250)

= -1700 + 8500

= 6800

b, 7.5 + 9 . [(-3) - (-27)]

= 16.5 . 24

= 396