来自卢静的问题
1.连比,若a/b=m/n和b/c=p/q,那么a:b:c=____2.若a/b=c/d,则有a+c/b+d=______
1.连比,若a/b=m/n和b/c=p/q,那么a:b:c=____2.若a/b=c/d,则有a+c/b+d=______
1回答
2020-04-22 13:58
1.连比,若a/b=m/n和b/c=p/q,那么a:b:c=____2.若a/b=c/d,则有a+c/b+d=______
1.连比,若a/b=m/n和b/c=p/q,那么a:b:c=____2.若a/b=c/d,则有a+c/b+d=______
a/b=m/n和b/c=p/q
a=bm/nc=bq/p
a:b:c=bm/n:b:bq/p=m/n:1:q/p
若a/b=c/d
令a/b=c/d=k
a=bkc=dk
a+c=k(b+d)
(a+c)/b+d)=k
(a+c)/(b+d)=a/b=c/d