问题描述:
根据2+4=6=2x3 2+4+6=12=3x4 2+4+6+8=20=4x5 2+4+6+8+10=30=5x6 计算 2a+4a+6a+.+100a的和
根据2+4=6=2x3
2+4+6=12=3x4
2+4+6+8=20=4x5
2+4+6+8+10=30=5x6
计算126a+128a+130a+132a.+300a
根据2+4=6=2x3
2+4+6=12=3x4
2+4+6+8=20=4x5
2+4+6+8+10=30=5x6
计算126a+128a+130a+132a.+300a
问题解答:
我来补答展开全文阅读