2sin30°－3sin45°×cos45°＋4cos60°
=2×1/2-3×√2/2×√2/2+4×1/2
=1-3/2+2
=5/2
sin30°－cos的平方45°＋4分之3tan的平方30°＋sin的平方60°－cos60°
=1/2-(√2/2)的平方+4分之3(√3/3)的平方+(√3/2)的平方-1/2
=1/2-1/2+1/4+3/4-1/2
=1/2
2sin30°－3sin45°×cos45°＋4cos60°
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