5: ① 60×﹙16+11﹚
=60×27
=1620
② 略
6: ① 80 88880
880 888880
8880 8888880
② = 987×﹙10--1﹚--3
= 9870--987--3
=8880
9876×﹙10--1﹚--4
=98760--9876--4
=88880
7: 96.7% 97.6% 96.9% 99.2% 98% 100%
8: ① ﹙42--35﹚÷35
= 20%
② ﹙35--30﹚÷35
≈14.3%
﹙42--30﹚÷42
≈28.6%
提交 重置