几道数学简便提,会几题写几题..2.4x20又5分之3+33.1x7.6(3又9分之2+9又3分之2)÷(9分之1+3分之1)2345+3452+4523+5234

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几道数学简便提,会几题写几题..2.4x20又5分之3+33.1x7.6(3又9分之2+9又3分之2)÷(9分之1+3分之1)2345+3452+4523+5234

几道数学简便提,会几题写几题..2.4x20又5分之3+33.1x7.6(3又9分之2+9又3分之2)÷(9分之1+3分之1)2345+3452+4523+5234
几道数学简便提,会几题写几题..
2.4x20又5分之3+33.1x7.6
(3又9分之2+9又3分之2)÷(9分之1+3分之1)
2345+3452+4523+5234

几道数学简便提,会几题写几题..2.4x20又5分之3+33.1x7.6(3又9分之2+9又3分之2)÷(9分之1+3分之1)2345+3452+4523+5234
1.
2.4*(20.6)+(20.6+12.5)*7.6
=20.6*(2.4+7.6)+12.5*(8-0.4)
=206+100-5
=301
2.
[12+2(1/9+1/3)]÷(1/9+1/3)
=12÷(1/9+1/3)+2
=12÷(4/9)+2
=12*9/4+2
=29
3.
=(2+3+4+5)*1111
=15554

2345+3452+4523+5234=15554