Question

计算题.1、 (-2)^3-|-2分之1|+(-4分之1)^-2×(π-3)^0

Answer 1

1,原式=-8-1/2+16*1=-8.5

2,a³×b^6﹣8a³b^6=-7a³b^6

3,4x²-12xy+9y²﹣9x²﹢y²=-5x²﹣12xy﹢10y²

4,﹙x²﹣y²﹚﹙x²﹢y﹚²＝x^4﹣y^4

5,﹙a+3b﹚﹙a-3b﹚-2c﹙a+3b﹚-2c﹙a﹣3b﹚+4c²

=a²﹣9b²-4ac+4c²

=﹙a-2c﹚²-9b²

=﹙a-2c+3b﹚﹙a-2c-3b﹚