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3×{8+4× [7-2×(-16+12+9)]}​

Răspuns :

3×{8+4×[7-2×(-16+12+9)]}=

3×{8+4×[7-2×(-4+9)]}=

3×[8+4×(7-2×5)]}=

3×[8+4×(7-10)]=

3×[8+4×(-3)]=

3×[8+(-12)=

3×(8-12)=

3×(-4)=

-12