10+11+12+13+14=几乘以几 23+24+25+26+27=几乘以几 210+220+230+240+250=几乘以几

问题描述:

10+11+12+13+14=几乘以几 23+24+25+26+27=几乘以几 210+220+230+240+250=几乘以几