E-3920 [ 2nd ] [ ENG SYM ] [ ][ ][ ] [ + ] 0.15 [ 2nd ][ ENG SYM ][ ] [ ]Example 15 ( 5 – 2 × 1.5 ) × 3 = 6[ ( ) ] 5 [ – ] 2 [ × ] 1.5 [ ][ × ] 3 [ ]Example 16 2 × { 7 + 6 × ( 5 + 4 ) } = 1222 [ × ] [ ( ) ] 7 [ + ] 6 [ × ][ ( ) ] 5 [ + ] 4 [ ]Example 17 120 × 30 % = 36120 [ × ] 30 [ 2nd ] [ % ][ ]7 88 55% = 160