Question

16×0.9×1.8简便计算？

Answer 1

简便计算：
16×0.9×1.8=
16×0.9×（0.9×2）
=16×2×0.9×0.9
=32×0.81
=（30+2）×0.81
=24.3+1.62
=25.92

Answer 2

16×0.9×1.8
=16×0.9×0.9×2
=16×2×0.9×0.9
=32×0.81
=32×1-32×0.19
=32-32×(0.2-0.01)
=32-32×0.2+32×0.01
=32-6.4+0.32
=32-6-0.4+0.32
=26-0.08
=25.92
————
16×0.9×1.8
=2×4×2×0.9×1.8
=2×4×0.9×2×1.8
=2×3.6×3.6
=2×(4-0.4)×(4-0.4)
=2×(4²-2×4×0.4+0.4²)
=2×(16-3.2+0.16)
=2×(16-3-0.2+0.16)
=2×(13-0.04)
=26-0.08
=25.92

Answer 3

16×0.9×1.8
=（16×1-16×0.1）×1.8
=（16-1.6）×（2-0.2）
=14.4×2-14.4×0.2
=28.8-2.88
=28.8-3+0.12
=25.92