…8分
四、20解（1）费用为814x2514x45元。…………………4分
（2）当x10时，14×1045或814×（1025）……………6分
19（元）………………………………………8分
五、21解：
（1）53108612100，
故回到了原来的位置；……………………………………………3分
（2）离开球门的位置最远是12米；……………………………………………6分
（3）总路程531086121054米．
故守门员小明在这次练习中共跑了54米．……………9分
六、22（1）图1中所有圆圈的个数为：123
（2）55……………………………………7分


1个…………………4分2
（3）图3中所有圆圈中各数之和：122232102385………………10分
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