chung minh a+b/c+d=b+c/d+a (biet a+b+c+dang khac 0)
Chung minh (a + c)^2 / a^2 - c^2 = (b + d)^2 / b^2 - d^2
Biet a/b = c/d
chung minh 2a+b/2a-b=2c+d/2c-d biet a/b=c/d
Cho a/b = b/c = c/d . CHung minh (a+b+c / b+c+d ) ^3 = a/d
cho a/b=b/c=c/d. chung minh(a+b+c/b+c+d)mu 3=a/d
cho a/b=c/d chung minh a-b/a+b=c-d/c+d
cho a/b=c/d chung minh a-b/a+b=c-d/c+d
cho a/b = c/d chung minh
1 a . ( b - d ) = ( a - c ) . b
2 ( a + c ) . d = c . ( b + d )
Tu ti le a/b=c/d hay chung minh rang a+b/a-b=c+d/c-d
