化简+【-(+7)】,-[-(-2.3)],-[+(-4分之1)】?

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化简+【-(+7)】,-[-(-2.3)],-[+(-4分之1)】?
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化简+【-(+7)】,-[-(-2.3)],-[+(-4分之1)】?
化简+【-(+7)】,-[-(-2.3)],-[+(-4分之1)】?

化简+【-(+7)】,-[-(-2.3)],-[+(-4分之1)】?
数负号“-”的个数就行了.奇数个为负,偶数个为正.
+【-(+7)】=-7
-[-(-2.3)]=-2.3
-[+(-4分之1)】=1/4

负负得正,正负得负
+[-(+7)]=+(-7)=-7
-[-(-2.3)]=-(+2.3)=-2.3
-[+(-1/4)]=-(-1/4)=1/4