528-84+54怎样简便计算
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528-84+54怎样简便计算
528-84+54怎样简便计算
528-84+54怎样简便计算
528-84+54
=528-(84-54)
=528-30
=498
54-84+528
=528-54-30+54
=528-30
=498
(520+4+4)-(80+4)+(50+4)
=520+4+4-80+4+50+4
=520-80+50+4+4+4+4
=490+4+4+4+4
=506
=528-(84-54)=528-30=(528+2)-30-2=530-30-2=500-2=498