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(√4*5+√9*5-√36*5)²=
(2√5+3√5-6√50²=(√5)²=5 B
26)
(√25*7+√36*7+√9*7)²= (5√7-6√7+3√7)²= (2√7)²=28 B
(2√7)²= 2*2*7=28