`a/b = c/d = c/d = (a+c+c)/(b+d+d) = (a+2c)/(b+2d)`.
`a/b = c/d = c/d = c/d = (a-c-c-c)/(b-d-d-d) = (a-3c)/(b-3d)`.
Vậy hai phân số trên bằng nhau và bằng `a/b, c/d`.
Các bn giúp mink vs ạ. Mình cảm ơi nhìu <3
Cho tỉ lệ thức a/b=c/d. Cmr: (a+2c)(b+d)=(a+c)(b+2d)
Cho a/b = c/d CMR
(a-b)^3/(c/d)^3=3a^2+2b^2/3c^2+2d^2
Giups mik vs ạ
A / b= c/ cmr a+ 2c/ b+2d = a-3c/ b-3c
cho a/b=c/d. CMR:
a,5a-3b/3a+2b=5c-3d/3c+2d
b,2a+7b/a-2b=2c+d/c-2d
c,ac/bd=(ac)mũ 2/(bd)mũ 2
d,2a mũ 2+3c mũ 2/3b mũ 2+3d mũ 2=5a mũ 2-2c mũ 2/2b mũ 2- 2d mũ 2
A)\(CMR:\frac{a+2c}{b+2d}\)\(=\frac{3a+c}{3b+d}\)
B)\(CMR:\frac{a-c}{a+3c}=\frac{b-d}{b+3d}\)
A)\(CMR:\frac{a+2c}{b+2d}\)\(=\frac{3a+c}{3b+d}\)
B)\(CMR:\frac{a-c}{a+3c}=\frac{b-d}{b+3d}\)
A)\(CMR:\frac{a+2c}{b+2d}\)\(=\frac{3a+c}{3b+d}\)
B)\(CMR:\frac{a-c}{a+3c}=\frac{b-d}{b+3d}\)
CHo a,b,c,d > 0 thỏa mãn a/b=c/d.
CMR ( a+2c/b+2d)^2 = a^2+2c^2/ b^2+ 2d^2
1)Cho a/a+b=c/c+d Chứng minh rằng: a/b= c/d 2)cho a/b=c/d, chứng minh rằng a)3a+2c/3b+2d=-5a+3c/-5b+3d b)a^2/b^2=2c^2-ac/2d^2-b-d NHANH NHA! MÌNH ĐANG CẦN GẤP!!!
