6.15-2.39+1.58-0.07,简便运算?
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解:
6.15-2.39+1.58-0.07
=6.15-2.39+(1.58-0.07)
=6.15-2.39+1.51
=6.15+1.51-2.39
=7.66-2.39
=7.66-2.4+0.01
=5.26+0.01
=5.27
6.15-2.39+1.58-0.07
=6.15-2.39+(1.58-0.07)
=6.15-2.39+1.51
=6.15+1.51-2.39
=7.66-2.39
=7.66-2.4+0.01
=5.26+0.01
=5.27
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