1. 12×(20+3) = 12×23=276
2. (-3)×[(-5-(-7)] =(-3)×((-5+7))=(-3)×2= -6
3. [(12×2)+(-3×(-2)]×3 =(24+6)×3=30×3=90
4. (4)×3+[(12+8)-(5-(-7)] =12+(20-12)=12+8=20
5. 5×10+8-(-7) =50+8+7=65
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1. 12×(20+3) = 12×23=276
2. (-3)×[(-5-(-7)] =(-3)×((-5+7))=(-3)×2= -6
3. [(12×2)+(-3×(-2)]×3 =(24+6)×3=30×3=90
4. (4)×3+[(12+8)-(5-(-7)] =12+(20-12)=12+8=20
5. 5×10+8-(-7) =50+8+7=65