Explicație pas cu pas:
a) inlocuim x cu -3 si ne da ca -6+6=0 (Adevarat)
b) facem la fel => -2*(-3)+6=0 => 6+6=0 (Fals)
c) 2/3*(-3)+7=5 => -2+7=5 <=> 7-2=5 (Adevarat)
d)-3_/5+7_/5=4_/5 (_/ = radical) => 7_/5-3_/5=4_/5 (Adevarat)
e)-15-15=0 (Fals)
f)-15/2+15/2=0 (Adevarat)
g)-9/4+7/2=0 => -9/4 + 14/4=0 => 5/4=0 (Fals)
h)-3_/3+2_/3=_/3 (Fals)