原式=a^2-a-ab+b
=a(a-1)-b(a-1)
=(a-b)(a-1)
=(-1+1/2)(-1-1)
=1
化简求值:a(a-b)-a+b,其中a=-1,b=-1/2
化简求值:a(a-b)-a+b,其中a=-1,b=-1/2
数学人气:986 ℃时间:2020-06-24 15:50:35
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