7.81×3.1+6.9×4.29+3.52×6.9的简便计算是什么？
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7.81×3.1＋6.9×4.29＋3.52×6.9＝7.81×3.1＋6.9×（4.29＋3.52）＝7.81×3.1＋6.9×7.81＝7.81×（3.1＋6.9）＝7.81×10＝78.1
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7.81×3.1+6.9×4.29+3.52×6.9
=7.81×3.1+6.9×(4.29+3.52)
=7.81×3.1+6.9×7.81
=7.81×(3.1+6.9)
=7.81×10
=78.1
=7.81×3.1+6.9×(4.29+3.52)
=7.81×3.1+6.9×7.81
=7.81×(3.1+6.9)
=7.81×10
=78.1
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7.81×3.1+6.9×4.29+3.52×6.9
=7.81×3.1+6.9×(4.29+3.52)
=7.81×3.1+6.9×7.81
=7.81×(3.1+6.9)
=7.81×10
=78.1
=7.81×3.1+6.9×(4.29+3.52)
=7.81×3.1+6.9×7.81
=7.81×(3.1+6.9)
=7.81×10
=78.1
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