计算:14/15×(5/14+5/21)+2/3
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/19 04:04:44
![计算:14/15×(5/14+5/21)+2/3](/uploads/image/z/66880-64-0.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A14%2F15%C3%97%285%2F14%2B5%2F21%29%2B2%2F3)
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