计算如下:
3/13-8/7+8/13-1/7
=(3/13+8/13)-(1/7+8/7)
=11/13-9/7
=(11×7-9×13)/(13×7)
=-40/91
3/13-8/7+8/13-1/7怎样简便运算
3/13-8/7+8/13-1/7
=(3/13+8/13)-(1/7+8/7)
=11/13-9/7
=(11×7-9×13)/(13×7)
=-40/91
3/13+8/13-8/7-1/7=11/13-9/7=77/91-117/91=-40/91
3/13-8/7+8/13+1/7
=(3/13+8/13)-(8/7-1/7)
=11/13-1
=-2/13
3/13-8/7+8/13-1/7
=3/13+8/13-(8/7+1/7)
=11/13-9/7
=77/91-117/91
=-40/91