计算题1.2.3.12ab2(abc)4÷(-3a2b3c)÷[2(abc)3]4.(a+b-c)(a-b+c) 

计算题

1.

2.

3.12ab2(abc)4÷(-3a2b3c)÷[2(abc)3]

4.(a+b-c)(a-b+c)

 

答案

 

1.原式=

2.原式= =-

3.原式=12a5b6c4÷(-3a2b3c)÷[2a3b3c3]

     =(-4a3b3c3)÷(2a3b3c3)

     =-2

 

4.原式=[a+(b-c)][a-(b-c)]

     =a2-(b-c)2

     =a2-(b2-2bc+c2)

     =a2-b2-c2+2bc

 解析:略

 

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