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Verified answer
Akar dari 80 × akar dari 15 : akar 75= akar (16×5) × akar 15 : akar (25×3)
= (4 × akar 5 × akar 15) : 5 ×akar 3
= 4 ×akar 75 : 5 ×akar 3
= 4 ×akar (25×3) : 5 ×akar 3
= 4 × 5 × akar 3 : 5 ×akar 3
= 4 ×(5×akar 3 : 5×akar3)
=4×1
=4