5sin 0度+2sin 90度-3cos 270度+4sin(-30度)cos240度-tan 1

网友回答

＝5*0+2*1+3*0-4*1/2*(-1/2)+1＝2+1+1=4
======以下答案可供参考======
供参考答案1:
5sin0°+2sin90°-3cos270°+4sin(-30°)cos240°-tan 135°
=0+2-3*cos90-4sin30*(-sin30)+tan45
=0+2-0+4*1/2*1/2+1
=2+1+1
=4供参考答案2:
5sin 0°+2sin 90°-3cos 270°+4sin(-30°)cos240°-tan 135°
=5sin 0°+2sin 90°-3*cos90°+4sin30°cos60°-tan45°
=2+4*1/2*1/2-1
=2+1-1
=2