-1/2a-2(a-1/2b^2)-(3/2a-1/3b^2)
=-1/2a-2a+b²-3/2a+1/3b²
=-4a+4/3b²
=4x2+4/3x(2/3)²
=8+4/3x4/9
=8+16/27
=8又16/27
先化简,再求值-1/2a-2(a-1/2b^2)-(3/2a-1/3b^2),其中a=-2,b=2/3
先化简,再求值-1/2a-2(a-1/2b^2)-(3/2a-1/3b^2),其中a=-2,b=2/3
数学人气:347 ℃时间:2020-04-24 04:53:48
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