练习十五\n2745\n838888909340458088909480899097\n33\n273303013131先算7+4=11再算20+11=31364404044444先算6+8=14再算30+14=4453714057\n3975457231762891948897873675787620+23=43(个)\n56+9=65(节)1333144410601787×23+8=31×67+2=69×5+47=52√\n25+8=33(只)208331855288819980815455414271\n263183374294\n18243036424824324048566435+7=42(只)<=>>><\n59377092809030+15+10=5525+20+5=506枚