(-3/4)×(-4/3)×13/8×(-28/13)=?thank you!thanks~

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(-3/4)×(-4/3)×13/8×(-28/13)=?thank you!thanks~
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(-3/4)×(-4/3)×13/8×(-28/13)=?thank you!thanks~
(-3/4)×(-4/3)×13/8×(-28/13)=?thank you!
thanks~

(-3/4)×(-4/3)×13/8×(-28/13)=?thank you!thanks~
(-3/4)×(-4/3)=1
13/8×(-28/13)=-28/8=-7/2
所以原式=1*-7/2=-7/2