Question

（3.2 +0.48）÷0.8的简便计算

Answer 1

（3.2+0.48）÷0.8
＝3.2÷0.8+0.48÷0.8
＝4+0.6
＝4.6

Answer 2

（3.2+0.48）÷0.8
=（3.2+0.48）×5/4
=3.2×5/4+0.48×5/4
=0.8×5+0.12×5
=4+0.6
=4.6

Answer 3

解：（3.2 +0.48）÷0.8等于（ 23/5 ），【即等于4.6】
∵已知需求出（3.2 +0.48）÷0.8等于多少
（A + B）× C = A × C + B × C
∴（3.2 + 0.48）÷ 0.8
= [（3×10+2）/10 + 48/100] ÷ 8/10
= （32/10 + 12/25）÷ 4/5
= （16/5 + 12/25）× 5/4
= 16/5 × 5/4 + 12/25 × 5/4
= 4 + 3/5
= 20/5 + 3/5
= 23/5
= 4.6
答：（3.2 +0.48）÷0.8等于23/5，【即等于4.6】