đưa máy tính mà tính chứ

a)=1/2 . 8/15 - 3/4.47/9

=4/15 - 47/12

=-73/20

b)=2-1/3 . -21/20

=2+7/20

=47/20

Câu b:

1/5 : 1/10 - 1/3.(6/5 - 9/4)

= 1/5 x 10 - 1/3.(24/20 - 45/20)

= 2 - 1/3.(-21/20)

= 2 + 7/20

= 40/20 + 7/20

= 47/20

Câu a:

xem lại đề bài

Câu b:

5 2/8x - 1/9 = 4 3/5

42/8x - 1/9 = 23/5

21/4x = 23/5 + 1/9

21/4x = 207/45 + 5/45

21/4x = 212/45

x = 212/45: 21/4

x = 212/45 x 4/21

x = 848/945

Vậy: x = 848/945

Câu c:

45%x - 2/3x = 75%

9/20x - 2/3x = 3/4

x(9/20 - 2/3) = 3/4

x(27/60 - 40/60) = 3/4

x.(-13/60) = 3/4

x = 3/4 : (-13/60)

x = 3/4 x (-60/13)

x = - 45/13

Vậy x = - 45/13

a)\(\frac{x}{5}=\frac{2}{5}\)

\(\Leftrightarrow x=\frac{2\times5}{5}=2\)

Vậy .............

b) \(\frac{3}{8}=\frac{6}{x}\)

\(\Leftrightarrow x=\frac{8\times6}{3}=16\)

Vậy ................

c) \(\frac{1}{9}=\frac{x}{27}\)

\(\Leftrightarrow x=\frac{1\times27}{9}=3\)

Vậy ................

d) \(\frac{4}{x}=\frac{8}{6}\)

\(\Leftrightarrow x=\frac{4\times6}{8}=3\)

Vậy ............

e) \(\frac{3}{x-5}=\frac{-4}{x+2}\)

\(\Leftrightarrow3\left(x+2\right)=-4\left(x-5\right)\)

\(\Leftrightarrow3x+6=-4x+20\)

\(\Leftrightarrow3x+4x=20-6\)

\(\Leftrightarrow7x=14\)

\(\Leftrightarrow x=2\)

Vậy .............

f) \(\frac{x}{-2}=\frac{-8}{x}\)

\(\Leftrightarrow x^2=16\)

\(\Leftrightarrow x=\pm4\)

Vậy ...............

\(\frac{x}{5}=\frac{2}{5}\Rightarrow x=\frac{2\times5}{5}=2\)

\(\frac{1}{9}=\frac{x}{27}\Rightarrow x=\frac{1\times27}{9}=3\)

\(\frac{4}{x}=\frac{8}{6}\Rightarrow x=\frac{8\times6}{8}=6\)

\(\frac{3}{x-5}=\frac{-4}{x+2}\)

\(\Rightarrow3.\left(x+2\right)=-4.\left(x-5\right)\)

\(\Rightarrow3x+6=-4x+20\)

\(\Rightarrow3x+4x=20-6\)

\(\Rightarrow7x=14\)

\(\Rightarrow x=2\)

\(10\left(x-7\right)-8\left(x+5\right)=6.\left(-5\right)+24\)

\(\Leftrightarrow\)\(10x-70-8x-40=-6\)

\(\Leftrightarrow\)\(2x-110=-6\)

\(\Leftrightarrow\)\(2x=104\)

\(\Leftrightarrow\)\(x=52\)

Vậy...

10.(x-7)-8(x+5)=6.(-5)+24

=> 10.x - 10.7 - 8.x + 8.5 = -30 + 24

=> 10.x - 70 - 8.x + 40 = -6

=> (10.x - 8.x) - (70-40) = 6

=> 2.x - 30 = 6

=> 2.x = 6 + 30

=> 2.x = 36

=> x = 36 : 2

=> x = 18

a) \(\frac{4^2.25^2+32,125}{2^3.5^2}=\frac{\left(4.25\right)^2+32,125}{8.25}=\frac{100^2+32,125}{200}=\frac{10000+32,125}{200}=\frac{10032,125}{200}=50,160625\)

b) \(\frac{4^5.9^4.2.6^9}{2^{10}.3^8+20}=\frac{2^{10}.3^8.2.2^9.3^9}{2^{10}.3^8+2^2.5}=\frac{2^{10}.3^9}{2^2.5}=\frac{20155392}{20}=1007769,6\)

Mình không chắc là đúng hay sai đâu nhé ! Nếu sai mong bạn thứ lỗi!