[(10+3-9) × (3×2-49)] : [(14+24-30-6) × (40-10+2-30)]
[(10+3-9) × (3×2-49)] : [(14+24-30-6) × (40-10+2-30)]
[(10+3-9) × (3×2-49)] : [(14+24-30-6) × (40-10+2-30)]
[4 x (6 - 49 )] : [2 x 2]
[4 x (-43)] : 4
-172 : 4= -43
[(10+3-9) × (3×2-49)] : [(14+24-30-6) × (40-10+2-30)] =
= [4 × (6-49)] : [2 × 2] =
= [4 × (-43)] : 4 =
= (-172) : 4 =
= -43