\(\frac{27}{x}=\frac{9}{50}\)

\(\Rightarrow27\times50=9\times x\)

\(\Rightarrow1350=9\times x\)

\(\Rightarrow x=1350:9=150\)

~ Hok tốt ~

\(\frac{2+3}{5+x}=\frac{5}{6}\)

\(\Rightarrow\left(5+x\right)\times5=\left(2+3\right)\times6\)

\(\Rightarrow\left(5+x\right)\times5=5\times6\)

\(\Rightarrow\left(5+x\right)\times5=30\)

         \(\Rightarrow\left(5+x\right)=30:5\)

         \(\Rightarrow\left(5+x\right)=6\)

                         \(\Rightarrow x=6-5\)

                         \(\Rightarrow x=1\)

trl

a x=150

b x = 1

hok tốt

\(9\cdot\left(x-6\right)=-50+-4\)

\(9\cdot\left(x-6\right)=-\left(50+4\right)\)

\(9\cdot\left(x-6\right)=-54\)

\(\left(x-6\right)=-54:9\)

\(\left(x-6\right)=-6\)

\(x=-6+6=0\)

Chúc bạn học tốt!!!

9(x-6)= -50 + -4

9(x-6) = -54

x-6 = -6

x = -1

\(9\left(x-6\right)=\left(-50\right)+\left(-4\right)\)

\(\Rightarrow9\left(x-6\right)=-54\)

\(\Rightarrow x-6=-6\)

\(\Rightarrow x=0\)

Vậy.....................................................

a, x⁵⁰ = x

=> x = 0 hoặc x=1

b, (x-6)² = 9 = 3² = (-3)²

TH1: (x-6)² = 3²

=> x - 6 = 3

=> x = 3+6

=> x = 9

TH2: (x-6)² = (-3)²

=> x - 6 = -3

=> x = -3 + 6

=> x = 3

a)x=0 hoặc1 

b)(x-6)²=3²

   x-6=3

     x=3+6

     x=9

li-ke cho mình nha

100 x 6 x 9 x 50 x 200 x 900 x 1000 x 2000 x 900 x 10 = 874800000000000000000

8748e+20(không thể tính được)

= 600 x 450 x 1800 x 2000 000 x 9000 

= 9477 e + 18

Help

a) \(\frac{18}{45}-\frac{4}{12}-\frac{6}{9}-\frac{21}{35}=\frac{2}{5}-\frac{1}{3}-\frac{2}{3}-\frac{3}{5}\)

\(=\left(\frac{2}{5}-\frac{3}{5}\right)-\left(\frac{1}{3}+\frac{2}{3}\right)\)

\(=\frac{-1}{3}-1\)

\(=\frac{-4}{3}\)

b) \(\frac{4}{3}+\frac{3}{5}+\frac{7}{3}+\frac{2}{5}+\frac{1}{3}=\left(\frac{4}{3}+\frac{7}{3}+\frac{1}{3}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)

\(=4+1=5\)

c) \(\frac{1}{3}.\frac{4}{5}.\frac{1}{3}.\frac{6}{5}=\frac{8}{75}\)

d) \(\frac{6}{7}.\frac{8}{13}+\frac{6}{7}.\frac{9}{13}-\frac{3}{13}.\frac{6}{7}\)

\(=\frac{6}{7}.\left(\frac{8}{13}+\frac{9}{13}-\frac{3}{13}\right)\)

\(=\frac{6}{7}.\frac{14}{13}\)

\(=\frac{12}{13}\)

a) 

= 25 x 4 x 7 x 9 

= 100 x 63

= 6300 

b) 

= 2 x 50 x 47 x 10 

= 100 x 470 

= 47000 

c) 

= 20 x 5 x 9 x 6

= 100 x 54 

= 5400 

Tính bằng cách hợp lí : 

a, 25 x 7 x 4 x 9

=  25 x 4 x 7 x 9

=    100 x 63

=      6300.

b,47 x 2 x 10 x 50 

=  47 x 10 x 2 x 50

=   270 x 100

=    27000.

c, 9 x 20 x 6 x 5 

=   9 x 6 x 20 x 5 

=     54 x 100

=       5400.

Alice lm đúng r !