作业帮a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/03 21:52:05
![a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]](/uploads/image/z/13827224-56-4.jpg?t=a%28a%2Bb%29-%5B0.5a%2Aa-0.5%28a%2Bb%29b-0.5b%28a-b%29%5D)
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
原式=a²+ab-(0.5a²-0.5ab-0.5b²-0.5ab+0.5b²)
=a²+ab-(0.5a²-ab)
=a²+ab-0.5a²+ab
=0.5a²+2ab
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
=a²＋ab-0.5(a²-ab-b²-ab+b²)
=a²＋ab-0.5×a²+ab
=0.5a²＋2ab