问题 计算题

计算(1)(15x2y﹣10xy2)÷5xy              

(2)(﹣2)2﹣20100+2﹣2

(3)(2x2y)2(﹣7xy2)÷(14x4y3)    

(4)(2x+3)(2x﹣3)

答案

解:(1)(15x2y﹣10xy2)÷5xy,

=15x2y÷5xy﹣10xy2÷5xy,

=3x﹣2y;

(2)(﹣2)2﹣20100+2﹣2

=4﹣1+

=3

(3)(2x2y)2(﹣7xy2)÷(14x4y3),

=4x4y2(﹣7xy2)÷(14x4y3),

=﹣28x5y4÷(14x4y3),

=﹣2xy;

(4)(2x+3)(2x﹣3),

=(2x)2﹣32

=4x2﹣9

选择题
单项选择题