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bukan bentuk akar = 3,5,7,11, 21
semoga seperti yang anda maksud
√((a + b) - 2√ab) = √a - √b
√((a + b) + 2√ab) = √a + √b
a√b + c√b = (a + c)√b
a√b - c√b = (a - c)√b