(1)128×78+256×11=128×78+128×(2×11)=128×78+128×22=128×(78+22)=128×100=12800;(2) 4 5 × 25 16 + 2 3 × 3 4 = 5 4 + 1 2 = 7 4 (3)13 7 13 -( 1 4 +3 7 13 )-0.75=13 7 13 -3 7 13 - 1 4 - 3 4 =10-1=9