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3.7x6.5+3.5
=（3.5+0.2）×6.5+3.5
=3.5×6.5+0.2×6.5+3.5×1
=3.5×7.5+1.3
=（5.5-2）（5.5+2）+1.3
=5.5²-4+1.3
=30.25+1.3-4
=31.55-4
=27.55
=（3.5+0.2）×6.5+3.5
=3.5×6.5+0.2×6.5+3.5×1
=3.5×7.5+1.3
=（5.5-2）（5.5+2）+1.3
=5.5²-4+1.3
=30.25+1.3-4
=31.55-4
=27.55
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