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2√5².7 - 5√7².7 + √3².7 - 3√4².7
2.5√7 - 5.7√7 + 3√7 - 3.4√7
10√7 - 35√7 + 3√7 - 12√7 --------------> a√b - c√b + d√b = a-c+d√b
(10-35+3-12)√7 = -34√7
= 2 √25 √7 - 5 √49 √7 + 3 √7 - 3 √16 √7
= 2. 5 √7 - 5. 7 √7 + 3 √7 -3. 4 √7
= 10√7 - 35√7 + 3√7 - 12√7
= (10 - 35 + 3 -12) √7 (difaktorkan)
= -34 √7