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AʮB x CʮD

(aʮb)x(cʮd)ʽ˶ʽ (aʮb)x(cʮd)=ac+bc+ad+bd ׷ʡ

(a-b)X(c-d)չ(a-b)(c-d)չ,Ӧó˷Լӷķ,m*(a+b)=ma+mb(a+b)*(c+d)=?m=(c+d)(a+b)*(c

a,b,c,dΪʽ,aʮbʮcʮdǵʽǶʽһ.1a=b=c=dһΪ0,ʱ,Ϊʽ.2abcd,,Ϊ

(a-b)X(c-d)չ=a(c+d)+b(c+d)=ac+ad+bc+bd ˰ɣʵʾ÷ɣ(a-b)*(c-d)=a(c-d)-b(c-d)=ac-ad-bc+bd

(aһb)x(Cʮd)=?(aһb)x(Cʮd)=ac+ad-bc-bd ɰ ׷~

a=b,c=dʽַ,-Java-CSDNʴȰջзָȻ=ָsplit忴ʲôԡ

axbʮc+d299a.b.c.dֱDzͬ.a.bжϵaȻܱ299a=13ôb+c+d=23 b=5 c=11 d=17 չݣ

a+b+c+d=10,ж?ô,ʮ,ֳĶ,жַַ.ʮмоŸ,ֳĶҲ

aʮ bcʮd=49 a b c dֵ⣺a+bc+d=49 abcd 1̣4δ֪

߼,aʮa[bʮc]ʮdʲôشaʮa[bʮc]ʮd = a+d

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