已知(a-2)²+(b+1)²=0,求代数式3a²b+ab²-3a²b+5ab+ab²-4ab+1/2a²b
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![已知(a-2)²+(b+1)²=0,求代数式3a²b+ab²-3a²b+5ab+ab²-4ab+1/2a²b](/uploads/image/z/3024130-58-0.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%88a-2%29%26%23178%3B%2B%EF%BC%88b%2B1%EF%BC%89%26%23178%3B%3D0%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F3a%26%23178%3Bb%2Bab%26%23178%3B-3a%26%23178%3Bb%2B5ab%2Bab%26%23178%3B-4ab%2B1%2F2a%26%23178%3Bb)
已知(a-2)²+(b+1)²=0,求代数式3a²b+ab²-3a²b+5ab+ab²-4ab+1/2a²b
已知(a-2)²+(b+1)²=0,求代数式3a²b+ab²-3a²b+5ab+ab²-4ab+1/2a²b
已知(a-2)²+(b+1)²=0,求代数式3a²b+ab²-3a²b+5ab+ab²-4ab+1/2a²b
a=2 b=-1
3a²b+ab²-3a²b+5ab+ab²-4ab+1/2a²b
=ab(3a+b+5+b-4+½a)
=-1×2×6
=-12