问题
解答题
化简:(1)
(2)求
|
答案
(1)原式=3y-1+2y-2
=5y-3;
(2)原式=
x-2x+1 2
y2-2 3
x+3 2
y21 3
=-3x+y2
当x=-2,y=
时,原式=-3×(-2)+(2 3
)22 3
=6+4 9
=64 9
化简:(1)
(2)求
|
(1)原式=3y-1+2y-2
=5y-3;
(2)原式=
x-2x+1 2
y2-2 3
x+3 2
y21 3
=-3x+y2
当x=-2,y=
时,原式=-3×(-2)+(2 3
)22 3
=6+4 9
=64 9