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