①3/4*2/7+5/7÷3/4 ②68/69*69
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 05:18:38
![①3/4*2/7+5/7÷3/4 ②68/69*69](/uploads/image/z/445508-44-8.jpg?t=%E2%91%A03%2F4%2A2%2F7%2B5%2F7%C3%B73%2F4+%E2%91%A168%2F69%2A69)
①3/4*2/7+5/7÷3/4 ②68/69*69
①3/4*2/7+5/7÷3/4 ②68/69*69
①3/4*2/7+5/7÷3/4 ②68/69*69
①3/4*2/7+5/7÷3/4
=3/4*2/7+5/7*4/3
=3/4*2/7+2/7*10/3
=(3/4+10/3)*2/7
= 49/12*2/7
=7/6
②68/69*69
=68*69/69
=68