简算4.2-25*0.7÷5 4.7*2.34-0.34*4.7 28.7*[0.54÷(8.7+45.3)]

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简算4.2-25*0.7÷54.7*2.34-0.34*4.728.7*[0.54÷(8.7+45.3)]简算4.2-25*0.7÷54.7*2.34-0.34*4.728.7*[0.54÷(8.7+

简算4.2-25*0.7÷5 4.7*2.34-0.34*4.7 28.7*[0.54÷(8.7+45.3)]
简算4.2-25*0.7÷5 4.7*2.34-0.34*4.7 28.7*[0.54÷(8.7+45.3)]

简算4.2-25*0.7÷5 4.7*2.34-0.34*4.7 28.7*[0.54÷(8.7+45.3)]
4.2-25*0.7÷5
=4.2-5*0.7
=4.2-3.5
=0.7
4.7*2.34-0.34*4.7
=4.7*(2.34-0.34)
=4.7*2
=9.4
28.7*[0.54÷(8.7+45.3)]
=28.7*[0.54÷54]
=28.7*0.01
=0.287