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简便运算9.875%{3又7/8u%}+3又4/1 67x4/1+2又2/1...

9.875-(3又8分之7-75%)+3又4分之1 =9.875-3又8分之7+75%+3又4分之1 =6+4 =10

19.4×(6+0.1)+2.3=19.4×6+19.4×0.1+2.3=(20-0.6)×6+2.3 5.67×(0.2+0.01)-0.62 0.8×(4+0.3)+1.25

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