-0.3+3又4分之1+2.6-5又2分之1+1.15

问题描述:

-0.3+3又4分之1+2.6-5又2分之1+1.15

-0.3+3又4分之1+2.6-5又2分之1+1.15
=-0.3+3.25+2.6-5.5+1.15
=(3.25+1.15+2.6)-(0.3+5.5)
=7-5.8
=1.2
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