21.(1)ԴhL(4)
u(2)ufeɷNɫĻνBo6;eɷNɫĻ]Bo4;eɷNеĻA干ͬɫĻo2
(3)挦ĻĶԺSufش(ni)_ʴ_o8;ش2o6;ش1o3
ڴЛ]нY(ji)ϲ]ĻĶͬ(^(q))ĻͬĻĻt2
22(1)Gɫ˞鱾h(hun)ѺsЧ_Űf(xi){(dio)ɳm(x)l(f)չ(6)
ufֻеһc硰˞鱾h(hun)ѺásЧ_Űݡɳm(x)l(f)չfĽo1չ_fĽo4
ڡƌW(xu)l(f)չ^ĺxo4
۱oYԴͱoh(hun)Ļ߽o2
ܕr¿ɳm(x)l(f)չ(zhn)Խo2.
ݾGɫ(jng)ĻȻλһw(6)
(2)ٽ(jng)棺ĸ_(yu)a(chn)I(y)Y(ji)(gu)D(zhun)(jng)Lʽṩˮƽȫ潨O(sh)СF(xin)ͬԣ(һɂcl(f)չa(chn)?q)_ŵĻ)
η棺ȫƽC
ĻƼ棺߿ƼˮƽPAĻͺɫĻĻʡ(Գֿƽd˲ŏ(zhn))B(ti)YԴ棺ԳB(ti)ʡO(sh)YԴ(ji)sh(hun)ѺO(sh)ȫB(ti)ʾ^(q)(oh(hun)҇Ļɳm(x)l(f)չ(zhn)ʡ(zhn)ˮƽƳ˾ӭh(hun))
ΘI(y)棺l(f)չɫήa(chn)I(y)ʡO(sh)҇θĸ(chung)µԇ^(q)һueȼĿĵ
A(ch)O(sh)ʩ:ӿA(ch)O(sh)ʩĽO(sh)߹(w)ˮƽ
t(y)l(wi)棺ĸt(y)Ĺ()ǶȵĻشo10磺߅СŬW(xu)(x)(ji)sˮ늡oh(hun)
uf
(2)С}M12֣8u֘˜ʽo
(lin)ϵόHĿ2.
ܴǶȵĵչ_fĽoֻһǶY(ji)ϺόHչ_fʴ_Ľo12(lin)ϵόHĽo10
ݏĹĽǶȱ(߅СŬW(xu)(x)(ji)sˮoh(hun))o10