55.5X44.5+55.5X56.5-55.5 15.4÷[8X(2.53+5.17)]

55.5X44.5+55.5X56.5-55.5
15.4÷[8X(2.53+5.17)] 怎么写没有未知数哦,单纯的简便运算

第1个回答  2015-01-20
55.5X44.5+55.5X56.5-55.5
=55.5X(44.5+56.5-1)
=55.5×100
=5550

15.4÷[8X(2.53+5.17)]
=15.4÷(8×7.7)
=15.4÷7.7÷8
=2÷8
=0.25本回答被网友采纳
第2个回答  2015-01-20
55.5×(44.5+56.5-1)
=55.5×100
=5550追答

15.4÷[8X(2.53+5.17)]
=15.4÷(8×7.7)
=15.4÷7.7÷8
=2÷8
=0.25

55.5X44.5+55.5X56.5-55.5 15.4÷[8X(2.53+5.17)]
55.5X44.5+55.5X56.5-55.5 =55.5X(44.5+56.5-1)=55.5×100 =5550 15.4÷[8X(2.53+5.17)]=15.4÷(8×7.7)=15.4÷7.7÷8 =2÷8 =0.25

怎样简便就怎样算
回答:第一个 把 55.5 ×(44.5+56.5-1)=5550 第二个 15.4÷[8×(2.53+5.17)] =15.4÷(7.7×8) =15.4÷7.7÷8 =0.25

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