a)56−(16)2=56−136=2936
(56−16)2=(23)2=49
2936>49
=>56−(16)2>(56−16)2;
b)250×(130)2=250×1900=518
250×(15)2−16=250×125−16=10−16=596
518<596
250×(56−16)2<250×(15)2−16;
c)315/1.5+425/1.5=(315+425)/1.5;
d)(925−2.18)/(345)+0.2)=−9150/4=−91200
925/345−2.18/0.2=995−10910=−2053190
−91200>−2053190
=>(925−2.18)/(345)+0.2)>925/345−2.18/0.2.