/b = c/d => a/c = b/d
=> a2 / c2 = b2 / d2 = ab / cd
<=> 7a2 / 7c2 = 11a2 / 11c2 = 8b2 / 8d2 = 3ab / 3cd
=> 7a2 + 3ab / 7c2 + 3cd = 11a2 - 8b2 / 11c2 - 8d2
=> 7a2 + 3ab / 11a2 - 8b2 = 7c2 + 3cd / 11c2 - 8d2
=> (đpcm)
CMR nếu a/b=c/d thì\(\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
C/m : nếu a/b = c/d thì
\(\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
Cho \(\frac{a}{b}=\frac{c}{d}.CMR:\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
cho a/b= c/d thì
chứng minh\(\frac{7a^2-3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
cho \(\frac{a}{b}=\frac{c}{d}\)
CMR
\(\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
Chứng minh rằng: Nếu \(\frac{a}{b}=\frac{c}{d}\)thì \(\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
chứng minh nếu :\(\frac{a}{b}=\frac{c}{d}\)thì \(\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2-8d^2}\)
cho \(\frac{a}{b}=\frac{c}{d}.chứngminhrằng:\frac{7a^2+3ab}{11a^2-8b^2}=\frac{7c^2+3cd}{11c^2+8d^2}\)
CMR: nếu a/b=c/d thì 7a^2 + 3ad / 11a^2-8b^2 = 7c^2 + 3cd / 11c^2-8d^2
