3/2(2x2−3x+1)−5/2(4−3x−x2).
问题描述:
(2x2−3x+1)−3 2
(4−3x−x2). 5 2
答
原式=2x2-
x+9 2
-10+3 2
x+15 2
x25 2
=(2+
)x2-(5 2
-9 2
)x+(15 2
-10)3 2
=
x2+3x-9 2
.17 2