Toán Lớp 7: Bài 4: Cho ????/????=????/????. ????ℎứ???????? ????????????ℎ ????ằ???????? ????^2+????^2/????^2+????^2=????/????
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Toán Lớp 7: Bài 4: Cho ????/????=????/????. ????ℎứ???????? ????????????ℎ ????ằ???????? ????^2+????^2/????^2+????^2=????/????
Comments ( 1 )
a/c=c/b
c.c=a.b
c^2=a.b
=>[a^2+c^2]/[b^2+c^2]
=[a.a+a.b]/[b.b+a.b]
=[a(a+b)]/[b(b+a)]
=[a\cancel{(a+b)}]/[b\cancel{(a+b)}]
=a/b
Vậy [a^2+c^2]/[b^2+c^2]=a/b