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3.5+3.87-1.56
=3.5+(3.87-1.56)
=3.5+2.31
=5.81
4.7-1.29-2.04
=4.7-(1.29+2.04)
=4.7-3.69
=1.01
15.4-0.33-1.67+38.6
=(15.4+38.6)-(0.33+1.67)
=54-2
=52
=3.5+(3.87-1.56)
=3.5+2.31
=5.81
4.7-1.29-2.04
=4.7-(1.29+2.04)
=4.7-3.69
=1.01
15.4-0.33-1.67+38.6
=(15.4+38.6)-(0.33+1.67)
=54-2
=52
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