= 4/5 - 9/16.4/5

= 4,5.(1-9/16)

= 4,5. 7/16

= 7/20

tính bằng cách thuận tiện nhất

a x 3,7 + a x 5,3 + a = 45

\(1.\dfrac{27^4.4^3}{9^5.8^2}=\dfrac{3^{12}.2^6}{3^{10}.2^6}=3^2=9\)

\(2.\dfrac{8^5.3^{15}}{2^{14}.81^4}=\dfrac{2^{15}.3^{15}}{2^{14}.3^{16}}=\dfrac{2}{3}\)

Ý 1:

\(\dfrac{27^4.4^3}{9^5.8^2}=\dfrac{\left(3^3\right)^4.\left(2^2\right)^3}{\left(3^2\right)^5.\left(2^3\right)^2}=\dfrac{3^{12}.2^6}{3^{10}.2^6}=3^2=9\)

Ý 2:

\(\dfrac{8^5.3^{15}}{2^{14}.81^4}=\dfrac{\left(2^3\right)^5.3^{15}}{2^{14}.\left(3^4\right)^4}=\dfrac{2^{15}.3^{15}}{2^{14}.3^{16}}=\dfrac{2^{14}.2.3^{15}}{2^{14}.3^{15}.3}=\dfrac{2}{3}\)

-3/7 + (-9)/35 + 2/-5

= -38/35

-38/35

\(3^0.3^5.3^7=3^{12}\)

\(16^3:4^2=4^6:4^2=4^4\)

\(2^4.4^3=2^4.2^6=2^{10}\)

\(2^4.5^4\left(2.5\right)^4=10^4\)

3⁰ . 3⁵ . 3⁷ = 3⁰⁺⁵⁺⁷= 3¹²

16³ : 4² = 4⁶ : 4² = 4⁴

2⁴ . 4³ = 2⁴ . 2⁶ = 2¹⁰

2⁴ . 5⁴ = ( 2.5 )⁴ = 10⁴

CHÚC BN HOK TỐT NHÉ !!!

1857 nha bạn tính máy tính là ra

1857 nha bạnnnnnnn!

\(\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}=\frac{3^4.\left(2^3-4\right)}{3^5.\left(3^2-5\right)}=\frac{8-4}{3.\left(9-5\right)}=\frac{4}{3.4}=\frac{1}{3}\)

\(\frac{3^4\cdot2^3-3^4\cdot4}{3^5.3^2-3^5\cdot5}=\frac{3^4\left(8-4\right)}{3^5\left(9-5\right)}=\frac{4}{3\cdot4}=\frac{1}{3}\)

làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người

nhanh nha mọi người

T.T

Bài làm:

\(A=\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}\)

\(A=\frac{2^2.3^4\left(2-1\right)}{3^5\left(3^2-5\right)}\)

\(A=\frac{4.1}{3.4}=\frac{1}{3}\)

Bài làm 

\(A=\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}=\frac{3^4\left(2^3-4\right)}{3^5\left(3^2-5\right)}\)

\(=\frac{81.2}{243.4}=\frac{81}{243.2}=\frac{81}{486}=\frac{1}{6}\)