若a>b,c>d>0,则下列不等式成立的是( )
A:a+d>b+c
B:a﹣d>b﹣c
C:ac>bd
D:ac< bd
Jason likes the of the cake.It is a heart.
式子x2﹣y2,a-b2,﹣3,n+1m中是整式的有( )
侵____犯(qīn qīng) 毡____帽(zhān zhàn) 咀____嚼(jǔ jǚ)
重____临(chóng zhòng) 磨____盘(mò mó) 系____好(jì xì)