Question

$\frac{3 \sqrt{147}+7 \sqrt{45} }{ \sqrt{63} } - \frac{ \sqrt{28}( \sqrt{20}- \sqrt{12} }{4 }$ totul la puterea a 2a inmultit cu $\frac{3}{8}$

Answer 1

[21√3+21√5/3√7-2√7(2√5-2√3)/5]²×3/8=[21×(√3+√5)/3√7-2√7(2√5-2√3)/5]²×3/8=[21×√7×(√3+√5)/3×7-2×2√7(√5-√3)/5]²×3/8=[(√7×(√3+√5)-√7(√5-√3)]²×3/8=(√21+√35-√35+√21)²×3/8=(2√21)²×3/8=4×21×3/8=63/2=31,5
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