cho ti le thuc a/b = c/d ,chung to rang a,3a + 2b / a = 3c + 2d / c ; b, 2a - 3b/ b = 2c - 3d / b ; c, a/ a-2b = c/c-2d giup minh voi dang can gap
cho \(\dfrac{a}{b}=\dfrac{c}{d}\left(a,b,c,d\ne0\right)\) chung minh rang
a ,\(\dfrac{a+b}{a-b}=\dfrac{c+d}{c-d}\)
b ,\(\dfrac{2a+5b}{3a-4d}=\dfrac{2c+5d}{3c-4d}\)
giup minh nhe minh dang can gap
cho tỉ lệ thức \(\dfrac{a}{b}\)chung minh \(\dfrac{a}{a-b}=\dfrac{a}{c-d}\)(giả thiet a khac b ,c khac d va a,b,c khac 0
chung minh m=a
Cho a/b=c/d. Hay chung to:
\(\dfrac{2d-3c}{d}=\dfrac{2b-3a}{b}\)
cho:\(\dfrac{a^2+b^2}{c^2+d^2}=\dfrac{ab}{cd}\)
chung min\(\dfrac{a}{b}=\dfrac{c}{d}\)hoặc \(\dfrac{a}{b}=\dfrac{d}{c}\)
cho a/b = c/d. chứng minh rằng a-c/a=b-d/b
cho a/b=c/d chứng minh rằng a-b/a = c-d/c