\(\dfrac{a}{b}=\dfrac{c}{d}\Rightarrow\dfrac{a}{c}=\dfrac{b}{d}=\dfrac{3b}{3d}=\dfrac{5a}{5c}=\dfrac{5a+3b}{5c+3d}=\dfrac{5a-3b}{5c-3d}\\ \Rightarrow\dfrac{5a+3b}{5a-3b}=\dfrac{5c+3d}{5c-3d}\)
Chứng minh đẳng thức: Nếu \(\dfrac{a}{b}=\dfrac{c}{d}\) thì \(\dfrac{5a+3b}{5a-3b}=\dfrac{5c+3d}{5c-3d}\)
1) So sánh :
a) \(3^{2^3}\) và (32)3 b) (-8)9 và (-32)5 c) 221 và 314
2) Cho \(\dfrac{a}{b}=\dfrac{c}{d}.\) Chứng minh rằng :
a)\(\dfrac{5a+3b}{5c+3d}=\dfrac{5a-3b}{5c-3d}\) b) \(\dfrac{ab}{cd}=\dfrac{\left(a+c\right)^2}{\left(b+d\right)^2}\)
a) Cho \(\dfrac{a}{b}\)=\(\dfrac{c}{d}\) CMR: \(\dfrac{5a+3b}{5a-3b}\)=\(\dfrac{5c+3d}{5c-3d}\)
b) CMR: Nếu \(\dfrac{a}{b}\)=\(\dfrac{c}{d}\) thì : \(\dfrac{a}{b}\)=\(\dfrac{3a+2c}{3b+2d}\)
c) CMR: Nếu \(\dfrac{a}{b}\)=\(\dfrac{c}{d}\) thì \(\dfrac{7a^2+3ab}{11a^2-8b^2}\) = \(\dfrac{7c^2+3cd}{11c^{2^{ }}-8d^2}\)
cho a/b=c/d chứng minh 5a+3b/5a-3b=5c+3d/5c-3d
cho a/b=c/d chứng minh 5a+3b/5a-3b=5c+3d/5c-3d
Chứng minh rằng a/b=c/b thì 5a+3b/5a-3b=5c+3d/5c-3d
Cho a /b =c/d .Chứng minh rằng 5a +3b /5c+3d =5a -3b/ 5c- 3d
# Thank you trc
cho a/b =c/d(c khác +-3/5d)
chứng minh rằng:5a+3b/5c+3d=5a-3b/5c-3d
GIÚP NHANH NHÉ
CHO TỈ LỆ THỨC a/b=c/d . chứng minh 5a+3b/5a-3b=5c+3d/5c-3d
