问题
解答题
计算:
(1)a2•a4+(-2a3)2+a8÷a2
(2)(x+2)(x-3)+3(x-1)(x+1)-(2x-1)2.
答案
(1)原式=a6+4a6+a6
=6a6;
(2)原式=x2-3x+2x-6+3(x2-1)-(4x2-4x+1)
=x2-3x+2x-6+3x2-3-4x2+4x-1
=3x-10.
计算:
(1)a2•a4+(-2a3)2+a8÷a2
(2)(x+2)(x-3)+3(x-1)(x+1)-(2x-1)2.
(1)原式=a6+4a6+a6
=6a6;
(2)原式=x2-3x+2x-6+3(x2-1)-(4x2-4x+1)
=x2-3x+2x-6+3x2-3-4x2+4x-1
=3x-10.