计算 0.25*(-2.15)+0.75*(+3.15)/3=?

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计算 0.25*(-2.15)+0.75*(+3.15)/3=?
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计算 0.25*(-2.15)+0.75*(+3.15)/3=?
计算 0.25*(-2.15)+0.75*(+3.15)/3=?

计算 0.25*(-2.15)+0.75*(+3.15)/3=?
0.25*(-2.15)+0.75*(+3.15)/3
= 0.25*(-2.15)+0.25*3*(+3.15)/3
=0.25*(-2.15)+0.25*(+3.15)
=0.25*(3.15-2.15)
=0.25