(1)-22-(-3)3×(-1)4-(-1)5(2)?48×(12?58+13?1116)(3)?14?16×[2?(?3)2](4)(x2+2xy+y2)

2025-03-11 06:08:06
推荐回答(1个)
回答1:

(1)原式=-4-(-27)×1-(-1)
=-4+27+1
=24;

(2)原式=-48×
1
2
-48×(-
5
8
)-48×
1
3
-48×(-
11
16

=-24+30-16
=-10;

(3)原式=-1-
1
6
×(2-9)
=-1+
7
6

=
1
6


(4)原式=x2+2xy+y2-x2+xy-y2
=3xy;

(5)原式=9a2-(7a2-2a-2a2+6a)-3
=9a2-7a2+2a+2a2-6a-3
=4a2-4a-3;

(6)原式=2a2b+6ab2-3a2b+3-2a2b-2
=6ab2-3a2b+1,
当a=-2,b=2时,原式=6×(-2)×22-3×(-2)2×2+1=-48-24+1=-72+1=-71.