8.6+0.15-3.2简便运算?
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解:8.6+0.15-3.2
=8-3+0.15+0.6-0.2
=5+0.15+0.4
=5+0.55
=5.55
=8-3+0.15+0.6-0.2
=5+0.15+0.4
=5+0.55
=5.55
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8.6+0.15一3.2
=9一0.4+0.2一0.05一3一0.2
=(9一3)+(0.2一0.2一0.4)一0.05
=6一0.4一0.05
=5.6一0.05
=5.55。
=9一0.4+0.2一0.05一3一0.2
=(9一3)+(0.2一0.2一0.4)一0.05
=6一0.4一0.05
=5.6一0.05
=5.55。
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