山西教育小学数学复习指导训练第67页第四题怎么做？

=3/16+8/13-11/16+5/13

=8/13+5/13-11/16+3/16

=1-8/16

=1/2

2.﹙4/3+2/5﹚×20+5/12

=4/3×20+2/5×20+5/12

=80/3+8+5/12

=35和1/12

3.9.25×9.9+0.925

=9.25×9.9+9.25×0.1

=9.25×﹙9.9+0.1﹚

=9.25×10

=92.5