问题
解答题
计算:
(1)6a3-(a2+1)•a
(2)x(4x-y)-(2x+y)(2x-y)
(3)(2a2-3a+1)•(-2a)-(4a3-3a2+2a)÷2a.
答案
(1)原式=6a3-a3-a
=5a3-a;
(2)原式=4x2-xy-4x2+y2
=y2-xy;
(3)原式=-4a3+6a2-2a-2a2+
a-13 2
=-4a3+4a2-
a-1.1 2
计算:
(1)6a3-(a2+1)•a
(2)x(4x-y)-(2x+y)(2x-y)
(3)(2a2-3a+1)•(-2a)-(4a3-3a2+2a)÷2a.
(1)原式=6a3-a3-a
=5a3-a;
(2)原式=4x2-xy-4x2+y2
=y2-xy;
(3)原式=-4a3+6a2-2a-2a2+
a-13 2
=-4a3+4a2-
a-1.1 2