Răspuns :
Răspuns:1)10/20+11/33+12/72=1/2+1/3+1/4=(6+4+3)/12=13/12=13/12
2) (2x-1)/3=(3x+1)/4
4(2x-1)=3(3x+1)
8x-4=9x+3
8x-9x=3+4
-x=7
x=-7
3)l=20π
d=π/2
d=20/10
d=10
Explicație pas cu pas:
Răspuns:1)10/20+11/33+12/72=1/2+1/3+1/4=(6+4+3)/12=13/12=13/12
2) (2x-1)/3=(3x+1)/4
4(2x-1)=3(3x+1)
8x-4=9x+3
8x-9x=3+4
-x=7
x=-7
3)l=20π
d=π/2
d=20/10
d=10
Explicație pas cu pas: