计算:202²+202×196+98
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 00:26:08
![计算:202²+202×196+98](/uploads/image/z/343880-8-0.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A202%26%23178%3B%2B202%C3%97196%2B98)
计算:202²+202×196+98
计算:202²+202×196+98
计算:202²+202×196+98
题目应该错了吧,
202²+202×196+98²
=202²+2×202×98+98²
=(202+98)²
=300²
=90000
202²+202×196+98
=202×(202+196)+98
=202×398+98
=202×(400-2)+98
=80800-404+(100-2)
=80900-406
=80494
。。。
202^2+202*202+98=202^2+2*202*98+98^2-98^2+98=(202+98)^2-98^2+98=300^2-(100-2)^2+98
=90000-10000+400-4+98=80494