c: =19(414-10-4)=19*400=7600
d: =841(20+30+50)+300
=84100+300
=84400
C) 19 × 419 - 19 × 10 - 19 × 4)
= 19 × (414 - 10 - 4)
= 19 × 400
= 7600
D) 841 × 20 + 30 × 841 + 50 × 841 + 300
= 841 × (20 + 30 + 50) + 300
= 841 × 100 + 300
= 84100 + 300
= 84400