计算:1、(-3x²y)(-4xy²-6x+1);2、(2a²-3分之1a-9分之1)(-9a);3、3a²(a³b²-2a)-4a(-a²b)²
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![计算:1、(-3x²y)(-4xy²-6x+1);2、(2a²-3分之1a-9分之1)(-9a);3、3a²(a³b²-2a)-4a(-a²b)²](/uploads/image/z/4002657-33-7.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A1%E3%80%81%28-3x%26%23178%3By%29%28-4xy%26%23178%3B-6x%2B1%29%EF%BC%9B2%E3%80%81%EF%BC%882a%26%23178%3B-3%E5%88%86%E4%B9%8B1a-9%E5%88%86%E4%B9%8B1%EF%BC%89%EF%BC%88-9a%EF%BC%89%EF%BC%9B3%E3%80%813a%26%23178%3B%EF%BC%88a%26%23179%3Bb%26%23178%3B-2a%EF%BC%89-4a%EF%BC%88-a%26%23178%3Bb%EF%BC%89%26%23178%3B)
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计算:1、(-3x²y)(-4xy²-6x+1);2、(2a²-3分之1a-9分之1)(-9a);3、3a²(a³b²-2a)-4a(-a²b)²
计算:1、(-3x²y)(-4xy²-6x+1);2、(2a²-3分之1a-9分之1)(-9a);
3、3a²(a³b²-2a)-4a(-a²b)²
计算:1、(-3x²y)(-4xy²-6x+1);2、(2a²-3分之1a-9分之1)(-9a);3、3a²(a³b²-2a)-4a(-a²b)²
解
(-3x²y)(-4xy²-6x+1)
=12x³y³+18x³y-3x²y
(2a²-1/3a-1/9)(-9a)
=-18a³+3a²+a
3a²(a³b²-2a)-4a(-a²b)²
=3a^5b²-6a³-4a(a^4b²)
=3a^5b²-4a^5b²-6a³
=-a^5b²-6a²