问题
解答题
(1)计算:-3×(-2)2+[(-3)×2]2; (2)计算:|-5
(3)5x4+3x2y-1-3x2y-6x4+2 (4)3( x2y+xy2 )-(3x2 y-1)-3xy2 |
答案
(1)-3×(-2)2+[(-3)×2]2;
=-3×4+36
=24;
(2)|-5
|×(1 2
-1 3
)×1 2
÷13 11 1 4
=
×(-1 2
)×1 6
×3 11 4 5
=-
;1 5
(3)5x4+3x2y-1-3x2y-6x4+2
=(5-6)x4+(3-3)x2y+2-1
=1-x4;
(4)3( x2y+xy2 )-(3x2 y-1)-3xy2
=3x2y+3xy2 -3x2 y+1-3xy2
=1.