问题
计算题
计算:(1)(2x﹣3y)2﹣(y+3x)(3x﹣y)
(2)(2+1)(22+1)(24+1)(28+1)﹣216
答案
解:(1)(2x﹣3y)2﹣(y+3x)(3x﹣y)
=4x2﹣12xy+9y2﹣(9x2﹣y2)
=4x2﹣12xy+9y2﹣9x2+y2
=﹣5x2﹣12xy+10y2
(2)(2+1)(22+1)(24+1)(28+1)﹣216
=(2﹣1)(2+1)(22+1)(24+1)(28+1)﹣216
=(216﹣1)﹣216
=216﹣1﹣216
=﹣1