È˽̰æÁùÄ꼶ϲáÊýѧ×÷Òµ±¾ÈýÔ²ÖùÓëԲ׶1Ô²ÖùµÚÁù¿Îʱ´ð°¸½­Î÷Ê¡

1ÈýÔ²ÖùÓëԲ׶1Ô²ÖùµÚÁù¿Îʱ¿ìÀÖʵ¼ù´ð°¸

86.4dm3

2ÈýÔ²ÖùÓëԲ׶1Ô²ÖùµÚÁù¿Îʱ×ß½üÉú»î´ð°¸

£¨1£©ÄÚоÃæ»ý£º3.14¡Á4¡Á11=138.16£¨cm2£©

Ìå»ý£º3.14¡Á£¨52-22£©¡Á11=725.34£¨cm3£©

£¨2£©ÈÝ»ý=3.14¡Á£¨12¡Â2£©2¡Á20+3.14¡Á£¨12¡Â2£©2¡Á5=2826£¨cm3£©=2826£¨mL£©

3ÈýÔ²ÖùÓëԲ׶1Ô²ÖùµÚÁù¿ÎʱÖÇ»ÛÌáÉý´ð°¸

½Ï´ó£¨Ô²A£©£º3.14¡Á£¨4¡Â2£©2¡Á6.28¡Ö78.88£¨cm3£©

½ÏС£¨Ô²C£©£º3.14¡Á£¨2¡Â2£©2¡Á12.56¡Ö39.44£¨cm3£©