a) 762 × 65 + 35 × 762 = 762 × ( 65 + 35 ) = 762 × 100 = 76 200
b) 15 × 348 - 288 × 15 = 15 × ( 348 - 288 ) = 15 × 60 = 900
c) 825 × 175 - 25 × 825 - 825 × 50 = 825 × ( 175 - 25 - 50 ) = 825 × 100 = 82 500
d) 33 × 672 - 33 × 322 - 250 × 33 = 33 × ( 672 - 322 - 250 ) = 33 × 100 = 3 300
