daca este corect asa cum ai scris exercitiul,ar da cam asa si cred ca e bine :
a) [(20+4) : 6-4]*32+7*(5*15-2*3*5)a:4+b*2+10*e=( 24: 6-4)×32+7×(75-30)×a:4+2b+10e=(4-4)×32+7×45a:4+2b+10e=
315a:4+2b+10e=315/4+8b/4+40e4=
315a+8b+40e
[1560-15*(67+11*3 ) ]*3-[117+21*(49-67) ] } :10=1,136,1