a: \(-37\cdot86+37\cdot76\)
\(=-37\left(86-76\right)\)
\(=-37\cdot10=-370\)
b: \(-79\cdot81+79\cdot31-79\cdot50\)
\(=79\left(-81+31-50\right)\)
\(=79\cdot\left(-100\right)=-7900\)
c: \(15\cdot\left(-176\right)+15\cdot75-\left(-15\right)\)
\(=15\cdot\left(-176\right)+15\cdot75+15\)
\(=15\left(-176+75+1\right)\)
\(=15\cdot\left(-100\right)=-1500\)
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a: −37⋅86+37⋅76
=−37(86−76)
=−37⋅10
=−370
b: −79⋅81+79⋅31-79.50
=79(−81+31−50)
=79⋅(−100)
=−7900
c: 15⋅(−176)+15⋅75−(−15)
=15⋅(−176)+15⋅75+15
=15(−176+75+1)
=15⋅(−100)
=−1500
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