问题
解答题
计算:
(1)2a2-a8÷a6
(2)(2-x)(2+x)-(x+4)(1-x)
答案
(1)原式=2a2-a2
=a2;
(2)原式=4-x2-(x-x2+4-4x)
=4-x2-x+x2-4+4x
=3x.
计算:
(1)2a2-a8÷a6
(2)(2-x)(2+x)-(x+4)(1-x)
(1)原式=2a2-a2
=a2;
(2)原式=4-x2-(x-x2+4-4x)
=4-x2-x+x2-4+4x
=3x.