-(-a+b-1)
=-(-a)-b-(-1)
=a-b+1
去括號:-(-a+b-1) A -a+b-1 B a+b+1 C a -b
去括號:-(-a+b-1) A -a+b-1 B a+b+1 C a -b
去括號:-(-a+b-1)
A -a+b-1 B a+b+1 C a -b +1 D -a+b+1
去括號:-(-a+b-1)
A -a+b-1 B a+b+1 C a -b +1 D -a+b+1
數(shù)學(xué)人氣:912 ℃時間:2020-02-05 17:16:32
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