问题
计算题
计算:(1)5a2b(﹣2ab3)+3ab(4a2b3);
(2)(5﹣2x)(2x+5)+(x+5)2.
答案
解:(1)5a2b(﹣2ab3)+3ab(4a2b3)
=﹣10a3b4+12a3b4
=2a3b4
(2)(5﹣2x)(2x+5)+(x+5)2
=25﹣4x2+x2+10x+25
=﹣3x2+10x+50
计算:(1)5a2b(﹣2ab3)+3ab(4a2b3);
(2)(5﹣2x)(2x+5)+(x+5)2.
解:(1)5a2b(﹣2ab3)+3ab(4a2b3)
=﹣10a3b4+12a3b4
=2a3b4
(2)(5﹣2x)(2x+5)+(x+5)2
=25﹣4x2+x2+10x+25
=﹣3x2+10x+50