4.8×0.125 5×2.5×12.5×64 用简便方法, 谢谢 4.6×1.9+5.4×1.9 6.5×12.8-6.5×2.8

2025-06-20 22:43:24
推荐回答(1个)
回答1:

4.8×0.125
=0.6x8x0.125
=0.6x1
=0.6

5×2.5×12.5×64
=5x2.5x12.5x2x4x8
=5x2x2.5x4x1.25x8
=10x10x10
=1000

4.6×1.9+5.4×1.9
=1.9x(4.6+5.4)
=1.9x10
=19

6.5×12.8-6.5×2.8
=6.5x(12.8-2.8)
=6.5x10
=65