0.6+0.059-0.01-0.009=?

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0.6+0.059-0.01-0.009=?
0.6+0.059-0.01-0.009=?

0.6+0.059-0.01-0.009=?
0.6+0.059-0.01-0.009
=0.6+(0.059-0.009)-0.01
=0.6+(0.05-0.01)
=0.6+0.04
=0.64

0.6+0.059-0.01-0.009
=0.6+[(0.059-0.009)-0.01]
=0.6+(0.05-0.01)
=0.6+0.04
=0.64

0.64