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11.(28 × 13) + (28 × 7)=364 + 196
=560.
12.(117 × 12) + (117 × 8)=1.404 + 936
=2.340.
13.(24 × 46) + (24 × 26)=1.104 + 624
=1.724.
14.(561 × (-67)) + (561 × 13)=-37.567 - 7.293
=-(37.567 + 7.293)
=-44.860)
15.121 × (30 - 2)=121 × 28
=3.388.
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