A.12.5 × 2.5 × 3.2 = 12.5 × 0.8 + 2.5 × 4 = 10 + 10 = 20 |
B.12.5 × 2.5 × 3.2 = (12.5 × 0.8) × (2.5 × 4) = 10 × 10 = 100 |
C.12.5 × 2.5 × 3.2 = (12.5 × 3.2) × (2.5 × 3.2) = 40 × 8 = 320 |
A.A>1 | B.A<1 | C.A=1 |
A.24.6×(4.6+0.44+1) | B.24.6×(4.6+4.4+1) | C.24.6×(4.6+4.4) |