Question

39.5x10.2-3.95×2怎么简便计算

Answer 1

39.5×10.2-3.95×2
=39.5×10.2-3.95×10×0.2
=39.5×10.2-39.5×0.2
=39.5×（10.2-0.2）
=39.5×10
=395

Answer 2

39.5x10.2-3.95×2
=3.95x10.2x10-3.95x2
=3.95x102-3.95x2
=3.95x(102-2)
=3.95x100
=395
希望对你有帮助，满意请及时采纳，
你的采纳是我回答的动力！