(-42.75)*(-27.36)-(-72.64)*(+42.75)=?

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(-42.75)*(-27.36)-(-72.64)*(+42.75)=?(-42.75)*(-27.36)-(-72.64)*(+42.75)=?(-42.75)*(-27.36)-(-72.64)

(-42.75)*(-27.36)-(-72.64)*(+42.75)=?
(-42.75)*(-27.36)-(-72.64)*(+42.75)=?

(-42.75)*(-27.36)-(-72.64)*(+42.75)=?
-42.75(-27.36-72.64)=-42.75*(-100)=4275

原式=-42.5*(-27.36-72.64)
=-42.5*(-100)
=4250

原是等于
42.75*27.36+72.64*42.75
=42.75*(27.36+72.64)
=4275