
16×0.9×1.8简便计算?
3个回答
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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
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

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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
=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
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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
=(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
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