2: Thực hiện phép tính (B1 trang 8 BD năng lực tự học)
1. 12.18+14.3-225:17
2. 68+42.5-625:25
3. 13+21.5-(198:11-8)
4. 272:16-5+4.(30-5-255:17)
5. 25.8-12.5+272:17-8
6. 125:25+14-142:71
7. 13.17-256:16+14:7-1
8. 15.24-14.5.(145:5-27)
9. 289:17-324:18+18:3 10.18.3-182+3.(51:17)
11.(64+115+36)-25.8
12.15.8-(17-30+83)-144:6
13.19+19.99-25.8 14.250:50-(46-75+54):5
15.13.(17-95+83):5-18:9
16.140-180.(47-90+43)+7
17.24.(15+30+85-120):10
18.27+73-30: (25-10)
19.18-4.(27-90+73):10
20.15-25.8:(100.2)
1. 12.18+14.3-255:17=216+42-15
=258-15
=243
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