如题所述
15x(3/5+2/7)x14
=15x14x(3/5+2/7)
=210x(3/5+2/7)
=210x3/5+210x2/7
=126+60
=186
=15x14x(3/5+2/7)
=210x(3/5+2/7)
=210x3/5+210x2/7
=126+60
=186
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第1个回答 2014-11-19
=15x14x3/5+15x14x2/7
=9x14+15x4
=126+60
=186
=9x14+15x4
=126+60
=186