计算: (1)x2-(x3y-2x2y2)﹢xy (2)(1-1/2)×(1+1/2)×(1+1/4)×(1+1/16) (3)(2x-3y)2-(y+3x)(3x-y) (4)(2a3b2-4a4b3+6a5b4)÷(-2a3b2)
问题描述:
计算:
(1)x2-(x3y-2x2y2)﹢xy
(2)(1-
)×(1+1 2
)×(1+1 2
)×(1+1 4
)1 16
(3)(2x-3y)2-(y+3x)(3x-y)
(4)(2a3b2-4a4b3+6a5b4)÷(-2a3b2)
答
(1)原式=x2-x3y+2x2y2+xy;
(2)原式=(1-
)×(1+1 4
)×(1+1 4
)=(1-1 16
)(1+1 16
)=1-1 16
=1 256
;255 256
(3)原式=4x2-12xy+9y2-9x2+y2=-5x2-12xy+10y2;
(4)原式=-1+2ab-3a2b2.