计算：14/15×(5/14+5/21)+2/3
问题描述：
计算：14/15×(5/14+5/21)+2/3
答
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
答
=14/15X5/14+14/15X5/21+2/3=11/9
答
等于77/3
答
=14/15×5/14+14/15×5/21+2/3
=1/3+2/3+2/9
=1又2/9
答
11/9
答
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
答
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
答
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