化简代数式|a+b|-|a-1| b a_____|__|_______|_______|____|__|_______|______________________ -1 0 1 2A.b+1 B.2a+b-1

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化简代数式|a+b|-|a-1| b a_____|__|_______|_______|____|__|_______|______________________ -1 0 1 2A.b+1 B.2a+b-1
化简代数式|a+b|-|a-1|
         b                                         a
_____|__|_______|_______|____|__|_______|______________________
                            -1            0       1                  2
A.b+1                 B.2a+b-1                C.-2a-b+1                  D.-b-1
打错了,那个"1"在"a"的后面一格。

化简代数式|a+b|-|a-1| b a_____|__|_______|_______|____|__|_______|______________________ -1 0 1 2A.b+1 B.2a+b-1
注意绝对值的含义:正数的绝对值是它本身,负数的绝对值是它的相反数,0的绝对值是0.
从数轴上看,a+b