如题所述
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41å1/3x3/4+51å1/4x4/5+61å1/5x5/6
=ï¼40+4/3ï¼x3/4+ï¼50+5/4ï¼x4/5+ï¼60+6/5ï¼x5/6
=40Ã3/4+4/3x3/4+50Ã4/5+5/4x4/5+60Ã5/6+6/5x5/6
=30+1+40+1+50+1
=123
41å1/3x3/4+51å1/4x4/5+61å1/5x5/6
=ï¼40+4/3ï¼x3/4+ï¼50+5/4ï¼x4/5+ï¼60+6/5ï¼x5/6
=40Ã3/4+4/3x3/4+50Ã4/5+5/4x4/5+60Ã5/6+6/5x5/6
=30+1+40+1+50+1
=123
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