(1)先化简,再求值;-3a²b+(3ab²-a²b)-2(2ab²-a²b),其中(a+1)²+|b+2|=0(2)已知a+3=0,|b|=4,|c|=5,且|b/c|=b/c,求ab-c的值
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![(1)先化简,再求值;-3a²b+(3ab²-a²b)-2(2ab²-a²b),其中(a+1)²+|b+2|=0(2)已知a+3=0,|b|=4,|c|=5,且|b/c|=b/c,求ab-c的值](/uploads/image/z/2096673-33-3.jpg?t=%281%29%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%3B-3a%26%23178%3Bb%2B%EF%BC%883ab%26%23178%3B-a%26%23178%3Bb%EF%BC%89-2%EF%BC%882ab%26%23178%3B-a%26%23178%3Bb%EF%BC%89%2C%E5%85%B6%E4%B8%AD%EF%BC%88a%2B1%EF%BC%89%26%23178%3B%2B%7Cb%2B2%7C%3D0%282%29%E5%B7%B2%E7%9F%A5a%2B3%3D0%2C%7Cb%7C%3D4%2C%7Cc%7C%3D5%2C%E4%B8%94%7Cb%2Fc%7C%3Db%2Fc%2C%E6%B1%82ab-c%E7%9A%84%E5%80%BC)
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(1)先化简,再求值;-3a²b+(3ab²-a²b)-2(2ab²-a²b),其中(a+1)²+|b+2|=0(2)已知a+3=0,|b|=4,|c|=5,且|b/c|=b/c,求ab-c的值
(1)先化简,再求值;-3a²b+(3ab²-a²b)-2(2ab²-a²b),
其中(a+1)²+|b+2|=0(2)已知a+3=0,|b|=4,|c|=5,且|b/c|=b/c,求ab-c的值
(1)先化简,再求值;-3a²b+(3ab²-a²b)-2(2ab²-a²b),其中(a+1)²+|b+2|=0(2)已知a+3=0,|b|=4,|c|=5,且|b/c|=b/c,求ab-c的值
(a+1)²+|b+2|=0
a+1=0,a=-1 b+2=0,b=-2
-3a²b+(3ab²-a²b)-2(2ab²-a²b)
=-3a²b+3ab²-a²b-4ab²+2a²b
=-2a²b-ab²
=-ab(a+b)
=-2x(-3)
=6
a+3=0,|b|=4,|c|=5,且|b/c|=b/c
a=-3,bc同号
(1)b=-4,c=-5
ab-c=12+5=17
(2)b=4,c=5
ab-c=-12-5=-17