1又3/7×﹙3又1/13-1又9/11﹚×0.7×28又3/5
=10/7×﹙40/13-20/11﹚×7/10×143/5
=﹙10/7×7/10﹚×﹙40/13×143/5-20/11×143/5﹚
=1×﹙8×11-4×13﹚
=88-52
=36
1又3/7×﹙3又1/13-1又9/11﹚×0.7×28又3/5
=10/7×﹙40/13-20/11﹚×7/10×143/5
=﹙10/7×7/10﹚×﹙40/13×143/5-20/11×143/5﹚
=1×﹙8×11-4×13﹚
=88-52
=36