Question

7.5×0.6+0.36×12.5+2.5×6.4怎么算？

Answer 1

解：7.5×0.6+0.36×12.5+2.5×6.4等于（25）
∵已知需求出7.5×0.6+0.36×12.5+2.5×6.4等于多少
∴7.5 × 0.6 + 0.36 × 12.5 + 2.5 × 6.4
= （7×10+5）/10 × 6/10 + 36/100 × （12×10+5）/10 + （2×10+5）/10 × （6×10+4）/10
= 75/10 × 3/5 + 9/25 × 125/10 + 25/10 × 64/10
= 15/2 × 3/5 + 9/25 × 25/2 + 5/2 × 32/5
= 9/2 + 9/2 + 16
= 18/2 + 16
= 18/2 + （2×16）/2
= 18/2 + 32/2
= 50/2
= 25
答：7.5×0.6+0.36×12.5+2.5×6.4等于25