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a+1=b+1 a+5=b-5 -a=-b a-b=0
a+b>0 |a|>|b| a﹣b>0 a•b>0
﹣3﹣2=﹣1 3a+2b=5ab 5xy﹣5yx=0 ﹣|﹣7|=7
b=atanA b=csinA a=ccosB c=asinA
a+1=b+1 a+5=b﹣5 ﹣a=﹣b a﹣b=0
ac>bc |a﹣b|=a﹣b ﹣a<﹣b<c ﹣a﹣c>﹣b﹣c
落在△ABC外的A.'处,折痕为DE.如果∠A.=α,∠CEA′=β,∠BDA'=γ,那么下列式子中正确的是( ) A.γ=2α+β γ=α+2β γ=α+β γ=180°﹣α﹣β
∣-5∣=-5 -∣-5∣= 5 -(-5)=- 5 -(-5)= 5
3a+2b=5ab 5xy-5yx=0
ac>bc |a﹣b|=a﹣b ﹣a<﹣b<c ﹣a﹣c>﹣b﹣c
ac > bc |a–b| = a–b –a <–b < c –a–c >–b–c
3a+2b=5ab 5xy-5yx=0