7.14×2.1+7.34×6.8+7.34×1.1简便计算？
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7.14×2.1+7.34×6.8+7.34×1.1
=（7.14+0.2-0.2）×2.1+7.34×6.8+7.34×1.1
=7.34×2.1-0.2×2.1+7.34×6.8+7.34×1.1
=7.34×（2.1+6.8+1.1）-0.2×2.1
=7.34×10-0.42
=73.4-0.42
=72.98
=（7.14+0.2-0.2）×2.1+7.34×6.8+7.34×1.1
=7.34×2.1-0.2×2.1+7.34×6.8+7.34×1.1
=7.34×（2.1+6.8+1.1）-0.2×2.1
=7.34×10-0.42
=73.4-0.42
=72.98
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