[1.25 × 7 + 1.25 - 3.7], [5.76 × 1.1 + 57.6 × 0.89], [36 × 2.54 + 1.8 × 49.2] 간편 한 계산 의

[1.25 × 7 + 1.25 - 3.7], [5.76 × 1.1 + 57.6 × 0.89], [36 × 2.54 + 1.8 × 49.2] 간편 한 계산 의

[1.25 × 7 + 1.25 - 3.7]
= 1.25 × (7 - 3.7)
= 1.25 × 3.3
= 4.125
[5.76 × 1.1 + 57.6 × 0.89]
= 5.76 × 1.1 + 5.76 × 8.9
= 5.76 × (1.1 + 8.9)
= 57.6
[36 × 2.54 + 1.8 × 49.2]
= 1.8 × (20 × 2.54) + 1.8 × 49.2
= 1.8 × (50.8 + 49.2)
= 1.8 × 100
= 180