5 ① 12×(1--60%)=12×0.4=4.8 ② 4.8÷﹙1--60%﹚=4.8÷0.4=12 6 ① 1.5×﹙1+20%﹚=1.5×1.2= 1.8 ② 1.8÷﹙1+20%﹚=1.8÷1.2=1.5 7: 1.27×﹙1--91.6%﹚=1.27×0.084=0.10668 8: 16÷﹙1--68%﹚=16÷0.32=50 9: 700÷﹙1--65%﹚=700÷0.35=2000 10: 64×5%×7%=0.224 11: ① 707÷70%=1010 ② 1010×﹙30--20﹚×1.5%=151.5 |