2+4+6+8+10+12+14+16+18=_×_.
问题描述:
2+4+6+8+10+12+14+16+18=______×______.
答
2+4+6+8+10+12+14+16+18,
=(2+18)×9÷2,
=20×9÷2,
=10×9.
故答案为:10,9.