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Sagot :

A : -5x(-3)-5x(-4)=
       15-(-20)=15+20=35
B : 17-6x[5+4x(-3)]=
     17-6x(5+(-12))=
     17-6x(5-12)=
       17-6x(-7)=17-(-42)=17+42=59
C : 5/6 + 1/2x(7/6-4/9)=
   5/6+1/2x(21/18-8/18)=
   5/6+1/2x(13/18)=
   5/6+13/36=30/36+13/36=43/36


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