4.2×2.16-2.16简便计算？
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4.2×2.16-2.16
=（4.2-1）x2.16
=3.2x2.16
=6.912
=（4.2-1）x2.16
=3.2x2.16
=6.912
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4.2×2.16-2.16简便计算？
4.2×2.16-2.16
=2.16x(4.2-1)
=2.16x3.2
=2.16x(3+0.2)
=6.48+0.432
=6.912
4.2×2.16-2.16
=2.16x(4.2-1)
=2.16x3.2
=2.16x(3+0.2)
=6.48+0.432
=6.912
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4.2×2.16-2.16简便计算？
4.2×2.16-2.16
=（4.2-1）×2.16
=3.2×2.16
=（3+0.2）×2.16
=3×2.16+0.2×2.16
=6.48+0.432
=6.912.
4.2×2.16-2.16
=（4.2-1）×2.16
=3.2×2.16
=（3+0.2）×2.16
=3×2.16+0.2×2.16
=6.48+0.432
=6.912.
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首先发现式子中有公因数
4.2x2.16-2.16
=（4.2-1）x2.16
=3.2x2.16
让后将3.2分开这样做乘法加法更简单
=3x2.16+0.2x2.16
=6.48+0.432
=6.912
4.2x2.16-2.16
=（4.2-1）x2.16
=3.2x2.16
让后将3.2分开这样做乘法加法更简单
=3x2.16+0.2x2.16
=6.48+0.432
=6.912
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4.2×2.16-2.16
=（4.2-1）×2.16
=3.2×2.16
=（3+0.2）×2.16
=3×2.16+0.2×2.16
=6.48+0.432
=6.912
=（4.2-1）×2.16
=3.2×2.16
=（3+0.2）×2.16
=3×2.16+0.2×2.16
=6.48+0.432
=6.912
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