1.tan45°-sin30°
=1-0.5=0.5
2.cos60°+sin45°-tan30°
=0.5+√2/2-√3/3
(1)sin60°-tan45°;
=√3/2-1
(2)cos60°+tan60°;
=0.5+√3
(3)根号2 /2 sin45°+sin60°-2cos45°.
=(√2/2)×(√2/2)+√3/2-√2
=1/2+√3/2-√2
1.tan45°-sin30°
=1-0.5=0.5
2.cos60°+sin45°-tan30°
=0.5+√2/2-√3/3
(1)sin60°-tan45°;
=√3/2-1
(2)cos60°+tan60°;
=0.5+√3
(3)根号2 /2 sin45°+sin60°-2cos45°.
=(√2/2)×(√2/2)+√3/2-√2
=1/2+√3/2-√2