3.7乘6.5加3.5的简便方法?
3个回答
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你好亲,下面是我给你的解答就是
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
3.7x6.5+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
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3.7×6.5+3.5
=(2.7+1)×6.5+3.5
=2.7×6.5+1×6.5+3.5
=(3-0.3)×6.5+6.5+3.5
=3×6.5-0.3×6.5+(6.5+3.5)
=19.5-1.95+10
=17.55+10
=27.55
=(2.7+1)×6.5+3.5
=2.7×6.5+1×6.5+3.5
=(3-0.3)×6.5+6.5+3.5
=3×6.5-0.3×6.5+(6.5+3.5)
=19.5-1.95+10
=17.55+10
=27.55
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