你可能感兴趣的试题
x+y+z=0 x+y-2z=0 y+z-2x=0 z+x-2y=0
a-2<b-2 3-a>3-b 2a>b >
sinA=sinB cosA=sinB sinA=cosB ∠A.+∠B.=90°
AC⊥BD OA=0C AC=BD A0=OD
AC=2OE BC=2OE AD=OE OB=OE
a-2<b-2 > 2a>b 3-a>3-b
sinA=sinB cosA=cosB sinA=cosB sin(A+B)=sinC
a+b>0 a-b>0 ab>0
AC=2OE BC=2OE AD=OE OB=OE
a+b>0 a﹣b>0 ab>0
a+b>0 a﹣b>0 ab>0
a+b>0 a-b>0 ab>0
tanA=cotB tanAcotB=1 (sinA)+(cosA)=1 ( )(sinA)+(sinB)=1