计算:14/15×(5/14+5/21)+2/3
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计算:14/15×(5/14+5/21)+2/3
计算:14/15×(5/14+5/21)+2/3
计算:14/15×(5/14+5/21)+2/3
14/15×(5/14+5/21)+2/3
=14/15×5/14+14/15×5/21+2/3
=1/3+2/9+2/3
=1又2/9
=14/15×5/14+14/15×5/21+2/3
=1/3+2/3+2/9
=1又2/9
14/15×(5/14+5/21)+2/3
=14/15×5/14+14/15×5/21+2/3
=1/3+2/3+2/9
=1又2/9
14/15×(5/14+5/21)+2/3
=
14/15×5/14+14/15×5/21+2/3
=1/3+2/3+2/9
=1又2/9
等于77/3
11/9
原式=14/15×(15/42+10/42)+2/3=14/15×25/42+2/3=(14×25)/(15×42)+2/3
=(2×5)/(3×6)+2/3=5/9+6/9=11/9
=14/15X5/14+14/15X5/21+2/3=11/9