丨a-2丨+丨b+1丨=O,求5a²b-3ab²+2ab的值
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丨a-2丨+丨b+1丨=O,求5a²b-3ab²+2ab的值丨a-2丨+丨b+1丨=O,求5a²b-3ab²+2ab的值丨a-2丨+丨b+1丨=O,求5a
丨a-2丨+丨b+1丨=O,求5a²b-3ab²+2ab的值
丨a-2丨+丨b+1丨=O,求5a²b-3ab²+2ab的值
丨a-2丨+丨b+1丨=O,求5a²b-3ab²+2ab的值
丨a-2丨+丨b+1丨=O,
a-2=0 b+1=0
a=2 b=-1
5a²b-3ab²+2ab的值
=5*2²*(-1)-3*2*(-1)²+2*2*(-1)
=-20-6-4
=-30