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5.6x6.7+4.4x2.1+4.4x4.6简便方法!
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5.6x6.7+4.4x2.1+4.4x4.6简便方法!
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5.6x6.7+4.4x2.1+4.4x4.6=5.6x6.7+4.4x(2.1+4.6)=5.6x6.7+4.4x6.7=(5.6+4.4)x6.7=10x6.7=67
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