作业帮A+2A+3A+.+49A+50A+50B+49B+.+2B+B
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 01:37:16
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A+2A+3A+.+49A+50A+50B+49B+.+2B+B
A+2A+3A+.+49A+50A+50B+49B+.+2B+B
A+2A+3A+.+49A+50A+50B+49B+.+2B+B
A+2A+3A+.+49A+50A+50B+49B+.+2B+B
= [（1+50)*50/2] *(A+B)
= 1275(A+B)
A+2A+3A+.+49A+50A+50B+49B+.+2B+B
化简多项式a-2a+3a-4a+5a-...+99a-100a用下面方法解决 a-(a+b)+(a+2b)-(a+3b)+...-(a+101b)解法1：a-2a+3a-4a+5a-..+99a-100a =(a+3a+5a+..+99a)+(-2a-4a-6a-...-100a)=2500a-2550a=-50a解法2：a-2a+3a-4a+5a-...+99a-100a=(a-2a)+(3a-4a)+(5a-6a)+..
计算(3a×a)+(2a×3a)+(3a×a)+[a×(a+2a+2a+2a+a)]
(a 1)(a 2)(a 3)(a
(a+2)(a+1)-a(a-3)
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