5-1+4=8

9+3-7=13

40:8x5=25

6x4:8=3

k nha

a) 2x=3y=5z và x,y,z=7200

b)x/2=4/3 và y/5=z/7 và 2x - 3y + Z =8

tong 2 so la

               167*2=334

so be la

             ( 334-92)/2=122

so lon la

              122+92=214

4 x 4 = 16

5 x 5 = 25

6 x 6 = 36

\(a.\frac{2^n}{32}=4\Rightarrow2^n=32.4=128=2^7\Rightarrow n=7\)

\(b.27^{n^{ }}.9^n=9^{27}:81\Rightarrow3^{3n}.3^{2n}=3^{54}:3^4\)

\(\Rightarrow3^{5n}=3^{50}\Rightarrow n=50:5=10\)

\(c.\frac{1}{9}.3^4.3^{n+1}=9^4\Rightarrow\frac{1}{3^2}.3^4.3^{n+1}=3^8\)

\(\Rightarrow3^2.3^{n+1}=3^8\Rightarrow3^{n+1}=3^6\Rightarrow n=6-1=5\)