问题 解答题

计算题:(1)3(4x-3)-(5x-6)

(2)(25x2+15x3y-20x4)÷(-5x2

答案

(1)3(4x-3)-(5x-6),

=12x-9-5x+6,

=7x-3;

(2)(25x2+15x3y-20x4)÷(-5x2),

=25x2÷(-5x2)+15x3y÷(-5x2)-20x4÷(-5x2),

=-5-3xy+4x2

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