3/7*83+4/7*85简算!
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/23 23:25:47
![3/7*83+4/7*85简算!](/uploads/image/z/5428603-19-3.jpg?t=3%2F7%2A83%2B4%2F7%2A85%E7%AE%80%E7%AE%97%21)
3/7*83+4/7*85简算!
3/7*83+4/7*85简算!
3/7*83+4/7*85简算!
3/7*83+4/7*85
=3/7x83+4/7x83+4/7x2
=(3/7+4/7)x83+8/7
=83+8/7
=84又1/7
配凑法
3/7*83+4/7*85
=3/7x83+4/7x83+4/7x2
=(3/7+4/7)x83+8/7
=83+8/7
=84又1/7
用到了乘法分配律
3/7*83+4/7*85
=3/7x83+4/7x(83+2)
=3/7x83+4/7x83+4/7x2
=(3/7+4/7)x83+8/7
=83+8/7
=84又1/7