5cos²60+4cos30-tan²45/sin30+cos²60
5*(1/2)²+4*(√3/2)²-(1)²/(1/2)²+(1/2)²
5*1/4+4*3/4-1÷1/4+1/4
5/4+3-1÷1/2
5/4+2÷1/2
5+8/4÷1/2
13/4÷1/2
13/4*2/1
13/2
=6.5
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5cos²60+4cos30-tan²45/sin30+cos²60
5*(1/2)²+4*(√3/2)²-(1)²/(1/2)²+(1/2)²
5*1/4+4*3/4-1÷1/4+1/4
5/4+3-1÷1/2
5/4+2÷1/2
5+8/4÷1/2
13/4÷1/2
13/4*2/1
13/2
=6.5