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Răspuns:
√5+√10×(√2+√5)/√10-[(√20-√8)/√160]×4√10-5√2=√5+√2+√5-[(√20-√8)/
4√10]×4√10-5√2=
√5+√2-(√20-√8)-5√2=
√5+√2-2√5+2√2-5√2=-√5-2√2