计ç®ç±æ²é¢z=x²+y²+1ï¼x=0ï¼y=0ï¼x=4ï¼y=4æå´æç«ä½çé¢ç§¯
解ï¼åºé¢ç§¯S₁=4Ã4=16; 侧é¢ç§¯ï¼y=0æ¶z=x²+1ï¼æ 左侧é¢ç§¯S₂ï¼
S₂=â«[0,4](x²+1)dx=[(1/3)x³+x][0,4]=(64/3)+4=72/3=24;
å½x=0æ¶z=y²+1.æ å侧é¢ç§¯S₃=S₂=24;
å½x=4æ¶z=17+y²ï¼æ å侧é¢ç§¯S4=â«[0,4](17+y²)dy=[17y+(1/3)y³][0,4]=98+(64/3)=358/3
å½y=4æ¶z=17+x²;æ å³ä¾§é¢ç§¯S5=S4=358/3;
æ²é¡¶é¢ç§¯S6ï¼
â´æ»é¢ç§¯S=S₁+2S₂+2S4+S6=16+2Ã24+2Ã(358/3)+32/3=64+(748/3)=940/3ï¼