化简:5(3a²b-ab²)-(ab²+3a²b),其中a=2份之1,b=3份之1
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![化简:5(3a²b-ab²)-(ab²+3a²b),其中a=2份之1,b=3份之1](/uploads/image/z/1252745-17-5.jpg?t=%E5%8C%96%E7%AE%80%3A5%283a%26%23178%3Bb-ab%26%23178%3B%29-%28ab%26%23178%3B%2B3a%26%23178%3Bb%29%2C%E5%85%B6%E4%B8%ADa%3D2%E4%BB%BD%E4%B9%8B1%2Cb%3D3%E4%BB%BD%E4%B9%8B1)
化简:5(3a²b-ab²)-(ab²+3a²b),其中a=2份之1,b=3份之1
化简:5(3a²b-ab²)-(ab²+3a²b),其中a=2份之1,b=3份之1
化简:5(3a²b-ab²)-(ab²+3a²b),其中a=2份之1,b=3份之1
5(3a²b-ab²)-(ab²+3a²b)
=15a²b-5ab²-ab²-3a²b
=(15a²b-3a²b)-6ab²
=12a²b-6ab²
=6ab(2a-b)
若a=1/2 b=1/3
6ab(2a-b)
=6*1/2*1/3(2*1/2-1/3)
=1-1/3
=2/3