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(2+3√5)×(3-2√5)=6-4√5+9√5-30=5√5-24
(2+3√5)×(3-2√5)=2 3/5*2 3/5=13/5*13/5=169/25=6 19/25
(4√3-7)²=(4√3)²-2×4√3×7+7²=16×3-56√3+49=48-56√3+49=97-56√3
tutaj trzeba po prostu pomnożyć liczby
(2+3√5)×(3-2√5)=2×3-2×2√5+3√5×3-3√5×2√5=6-4√5+9√5-6×5=6+5√5-30=5√5-24