（0.25+25/4）×4/15+6.5×11/15
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（0.25+25/4）×4/15+6.5×11/15（0.25+25/4）×4/15+6.5×11/15（0.25+25/4）×4/15+6.5×11/15（0.25+25/4）×4/15+6.5×1
（0.25+25/4）×4/15+6.5×11/15
（0.25+25/4）×4/15+6.5×11/15
（0.25+25/4）×4/15+6.5×11/15
（0.25+25/4）×4/15+6.5×11/15
=（1/4+25/4）x4/15+13/2x11/15
=13/2x4/15+13/2x11/15
=13/2x(4/15+11/15)
=13/2
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(0.25+25/4）×4/15+6.5×11/15
=(1/4+25/4)x4/15 +13/2X11/15
=13/2x4/15+13/2x11/15
=13/2x(4/15+11/15)
=13/2