Question

计算下列各题：（1）sin230°+cos245°+2sin60°?tan45°；（2）12-4sin60°+（tan30°+1）0

计算下列各题：（1）sin230°+cos245°+2sin60°?tan45°；（2）12-4sin60°+（tan30°+1）0．

Answer 1

（1）原式=（

1

2

）²+（

2

2

）²+

2

×

3

2

×1
=

1

4

+

1

2

+

6

2

=

3

4

+

1

2

6

；

（2）原式=2

3

-4×

3

2

+1
=2

3

-2

3

+1
=1．