(1) 1/4√256+√0.25 (2) 2√2＋3√5－3√2－3√5 (3) √(﹣2/5)²－√1－(﹣4/5)²

(1) 1/4√256+√0.25 (2) 2√2＋3√5－3√2－3√5 (3) √(﹣2/5)²－√1－(﹣4/5)²
(1) 1/4√256+√0.25 (2) 2√2＋3√5－3√2－3√5 (3) √(﹣2/5)²－√1－(﹣4/5)²

(1) 1/4√256+√0.25 (2) 2√2＋3√5－3√2－3√5 (3) √(﹣2/5)²－√1－(﹣4/5)²
(1) 1/4√256+√0.25
=1/4×16+0.5
=4+0.5
=4.5
(2) 2√2＋3√5－3√2－3√5
=（2√2-3√2）+（3√5-3√5）
=-√2
(3) √(﹣2/5)²－√1－(﹣4/5)²
=2/5-√9/25
=2/5-3/5
=-1/5